Part of the terrorists plan, is to blend in with Western society as much as possible and that means taking up the living habits of westerners.
If they were just trying to blend in then we would not expect their bar to be operating in a Muslim quarter.
After 9/11, I believe it was discovered, several of the hijackers were going out to bars and living a western style life to fit in.
We have no evidence that fitting in was their motivation.
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