Defending monopolies now?
Monopolies are completely possible without any action by the government.
Coercive monopolies, a sub-category, are completely possible without any action by a government.
Any time you have a high barrier to entry, you will get consolidation and a potential for monopolies, existance of government or not.
I reject your assertion, and have just as much support for my statements as you have, in what amounts to a matter of opinion.
As for implying that monopolies are "good for the consumer", that fully contradicts the understanding modern economics.
http://en.wikipedia.org/wiki/Monopoly for more details. See the term "deadweight" loss.
Those consumers would most likely have been better off without Standard Oil's monopoly.