That could be but, I would argue this tendency is so pervasive and so long held as to render the religion as is believed -- a violent one that will accept nothing, from non-adherants, short of conversion, dhimmitude, or death.
There are a billion Muslims around the globe -- most of them in the Arab Middle East and Northern Africa -- and I would challenge you to find any Islamic religious leader, outside the Western World (and, to be sure, there aren't many there either -- and, even fewer willing to oppose this view publicly) that do not hold this view of Islam and preach it from their pulpits at every opportunity.