Carrying out a terrorist attack and supporting one are two separate issues.
ICM Poll: 20% of British Muslims sympathize with 7/7 bombers
http://www.telegraph.co.uk/news/ukne...law-in-UK.htmlNOP Research: 1 in 4 British Muslims say 7/7 bombings were justified
http://www.cbsnews.com/stories/2006/...ate=2011-04-06
http://www.webcitation.org/5xkMGAEvY
Channel Four (2006): 31% of younger British Muslims say 7/7 bombings were justified compared to 14% of those over 45.
http://www.policyexchange.org.uk/ima...20jan%2007.pdf
People-Press: 31% of Turks support suicide attacks against Westerners in Iraq.
http://people-press.org/report/206/a...after-iraq-war
YNet: One third of Palestinians (32%) supported the slaughter of a Jewish family, including the children:
http://pajamasmedia.com/tatler/2011/...t-infanticide/
http://www.ynetnews.com/articles/0,7...053251,00.html
World Public Opinion: 83% of Egyptians approve of attacks on American troops.
26% of Indonesians approve of attacks on American troops.
26% of Pakistanis approve of attacks on American troops.
68% of Moroccans approve of attacks on American troops.
90% of Palestinians approve of attacks on American troops.
72% of Jordanians approve of attacks on American troops.
52% of Turks approve of some or most groups that attack Americans (39% oppose)
A minority of Muslims disagreed entirely with terror attacks on American troops.
About half of those opposed to attacking Americans were sympathetic with al-Qaeda’s at ude toward the U.S.
http://www.worldpublicopinion.org/pi..._Feb09_rpt.pdf
World Public Opinion (2009): 30% of Palestinians support attacks on American civilians working in Muslim countries. 24% support the murder of Americans on U.S. soil.
Only 74% of Turks and 55% of Pakistanis disapprove of terror attacks against civilians on U.S. soil.
http://www.worldpublicopinion.org/pi..._Feb09_rpt.pdf
Pew Research (2010): 55% of Jordanians have a positive view of Hezbollah
30% of Egyptians have a positive view of Hezbollah
45% of Nigerian Muslims have a positive view of Hezbollah (26% negative)
43% of Indonesians have a positive view of Hezbollah (30% negative)
http://pewglobal.org/2010/12/02/musl...and-hezbollah/
Pew Research (2010): 60% of Jordanians have a positive view of Hamas (34% negative).
49% of Egyptians have a positive view of Hamas (48% negative)
49% of Nigerian Muslims have a positive view of Hamas (25% negative)
39% of Indonesians have a positive view of Hamas (33% negative)
http://pewglobal.org/2010/12/02/musl...and-hezbollah/
Pew Research (2010): 15% of Indonesians believe suicide bombings are often or sometimes justified.
34% of Nigerian Muslims believe suicide bombings are often or sometimes justified.
http://pewglobal.org/2010/12/02/musl...and-hezbollah/
16% of young Muslims in Belgium state terrorism is "acceptable".
http://www.hln.be/hln/nl/1275/Islam/article/detail/1619036/2013/04/22/Zestien-procent-moslimjongens-vindt-terrorisme-aanvaardbaar.dhtml
Populus Poll (2006): 12% of young Muslims in Britain (and 12% overall) believe that suicide attacks against civilians in Britain can be justified. 1 in 4 support suicide attacks against British troops.
http://www.danielpipes.org/blog/2005...itish-islamist
Pew Research (2007): 26% of younger Muslims in America believe suicide bombings are justified.
35% of young Muslims in Britain believe suicide bombings are justified (24% overall).
42% of young Muslims in France believe suicide bombings are justified (35% overall).
22% of young Muslims in Germany believe suicide bombings are justified.(13% overall).
29% of young Muslims in Spain believe suicide bombings are justified.(25% overall).
http://www.pewresearch.org/files/old...ns.pdf#page=60
Pew Research (2011): 8% of Muslims in America believe suicide bombings are often or sometimes justified (81% never).
28% of Egyptian Muslims believe suicide bombings are often or sometimes justified (38% never).
http://www.people-press.org/2011/08/...for-extremism/
Pew Research (2007): Muslim-Americans who identify more strongly with their religion are three times more likely to feel that suicide bombings are justified
http://www.pewresearch.org/files/old...ns.pdf#page=60
27% of British Muslims do not support the deportation of Islamic extremists preaching violence and hate.
http://www.danielpipes.org/blog/2005...-islamist.html
Federation of Student Islamic Societies: About 1 in 5 Muslim students in Britain (18%) would not report a fellow Muslim planning a terror attack.
http://www.danielpipes.org/blog/2005...itish-islamist
ICM Poll: 25% of British Muslims disagree that a Muslim has an obligation to report terrorists to police.
http://www.danielpipes.org/blog/2005...itish-islamist
Populus Poll (2006): 16% of British Muslims believe suicide attacks against Israelis are justified.
37% believe Jews in Britain are a "legitimate target".
http://www.danielpipes.org/blog/2005...itish-islamist
World Public Opinion: Majorities in Egypt (63%) and Libya (61%) supported the 9/11/2012 attacks against American embassies, including Benghazi.
http://www.worldpublicopinion.org/pi...d=&id=&pnt=727
Pew Research (2013): At least 1 in 4 Muslims do not reject violence against civilians (study did not distinguish between those who believe it is partially justified and never justified).
http://www.pewforum.org/uploadedFiles/Topics/Religious_Affiliation/Muslim/worlds-muslims-religion-politics-society-full-report.pdf
Pew Research (2013): 15% of Muslims in Turkey support suicide bombings (also 11% in Kosovo, 26% in Malaysia and 26% in Bangladesh).
http://www.pewforum.org/uploadedFiles/Topics/Religious_Affiliation/Muslim/worlds-muslims-religion-politics-society-full-report.pdf
PCPO (2014): 89% of Palestinians support Hamas and other terrorists firing rockets at Israeli civilians.
http://www.jihadwatch.org/2014/08/poll-89-of-palestinians-support-jihad-terror-attacks-on-israely
Pew Research (2013): Only 57% of Muslims worldwide disapprove of al-Qaeda. Only 51% disapprove of the Taliban. 13% support both groups and 1 in 4 refuse to say.
http://www.pewglobal.org/2013/09/10/muslim-publics-share-concerns-about-extremist-groups/
BBC Radio (2015): 45% of British Muslims agree that clerics preaching violence against the West represent "mainstream Islam".
http://www.comres.co.uk/polls/bbc-radio-4-today-muslim-poll/
Palestinian Center for Political Research (2015): 74% of Palestinians support Hamas terror attacks.
http://www.timesofisrael.com/support-for-hamas-skyrockets-following-war-poll-shows/
Pew Research (2014): 47% of Bangladeshi Muslims says suicide bombings and violence are justified to "defend Islam". 1 in 4 believed the same in Tanzania and Egypt. 1 in 5 Muslims in the 'moderate' countries of Turkey and Malaysia.
http://www.pewglobal.org/2014/07/01/concerns-about-islamic-extremism-on-the-rise-in-middle-east/
The Polling Company CSP Poll (2015): 19% of Muslim-Americans say that violence is justified in order to make Sharia the law in the United States (66% disagree).
http://www.centerforsecuritypolicy.o...-Poll-Data.pdf
The Polling Company CSP Poll (2015): 25% of Muslim-Americans say that violence against Americans in the United States is justified as part of the "global Jihad (64% disagree).
http://www.centerforsecuritypolicy.o...-Poll-Data.pdf
The Sun (2015: Following Nov. 2015 attacks in Paris, 1 in 4 young Muslims in Britain (and 1 in 5 overall) said they sympathize with those who fight for ISIS.
http://www.thesun.co.uk/sol/homepage...s-in-poll.html
ICM (2016): 2 in 3 Muslims in Britain would not report terror plot to police.
http://www.thetimes.co.uk/tto/news/u...cle4730825.ece
See also: http://wikiislam.net/wiki/Muslim_Statistics_(Terrorism) for further statistics on Islamic terror.