Big evil made possible by ten thousand little evils and a million accomodations with evil.
Yep, by tacitly going along with an ideology/doctrine, it is reinforced. Unfortunately, this also includes all the moderate Muslims who one one hand denounce terrorism, but on the other hand defend the book that is all derives from. No matter if they are completely sincere about their aversion to violence. There was one of those typical 'modern' muslims on a debate recently, with nicely fashionable hijab, clothes etc, stating categorically that you cannot be gay and a Muslim (the debates topic), and that it has to be one or the other, despite her 'modern' views in other areas - how much she deplored ISIL, violence and so on. It was pointed out that by following the same logic as her denial that a gay Muslim is a real Muslim, she wasn't a true Muslim either, in that her face wasn't covered, use of make up, talking in front of men, not averting her gaze etc. She laughed at that with a 'Oh don't be ridiculous' comment, as they do - but drop her in the middle of Raqqa, I think she might very quickly change her tune, her hijab, or her religion. That's one of the problems with reformation, the Muslim voice in the west who have laughed at the idea of a true Islamic state for years crying 'paranoia' - they are helping with the momentum of a big evil, first by denying it, calling radical Islam a tiny minority of loonies, and now by pretending the Koran is innocent, and that it's this 'tiny minority' who go around interpreting it all wrong. Which is actually bollocks, of course.