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It can be very complex.
Two reasons I know for sure:
1. They're insane, who in their right minds would do such things. Most extremists are way beyond aggressive and hateful.
2. They're followers of the insane. According to lectures from the Abnormal Psychology course I took last semester, people who are influenced by the insane act insane. Especially if that is all they know. For example, a child of a mentally ill
mother will likely behave like his/hers parent until they get exposed to something else. In some cases, that is too late. Now, put that on a larger scale.
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