No, the choice to allow ideas into one's head without evaluating them is personal, but once the passivity has been established, they don't have much resistance to the logical consequences of whatever they choose to be a vehicle for. They have chosen to let it be. My point is that they did not originate the idea. Those types can't. Thought is not passive.
This group has certainly become like the McDonald's of jihad murder, but they aren't special or exclusive in the least. The only difference between them and something like the Brotherhood is that they don't have the need for any illusions of civility. Before IS, there were the groups like Hamas and Hezbollah, who paid lip service to principles of justice while killing indiscriminately. They were the extremists to the Brotherhood's moderation. Now they've dropped the civil pretense and openly declare their intent to conquer. You can call them crazy, but was Said Qutb crazy? Hassan al-Banna?
What's the difference between a homicidal maniac and the purveyors of a really ****ing bad idea? Crazy needs structure, particularly if it's going to serve a purpose. That structure is the system of ideas which vindicates them in committing what are categorically evil acts that would cause most people to lose their minds were they to follow suit.
