What has turned Western Europe and other Westerners into terrorist supporters?

It seems they go as far as possible to support organizations that would kill them

Truly bizarre

New Rule: Clash of Civilizations Real Time with Bill Maher (HBO) / Real Time with Bill Maher

https://www.youtube.com/watch?v=8xbwnnQPXR4

What has turned Western Europe and other Westerners into terrorist supporters?
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