People are people, though. It's convenient to say that the religions you were raised in and/or around are the good ones and the ones you weren't raised in or around are the less good ones, but it's the same story from all sides, so it's almost certainly a wash.

People on fundamentalist rampages say it's because of their religion. However, the people swooping in to help in the aftermath of such events also say they are doing so because of their religion, and the vast majority of the time (the world over), it's the same religion in both cases. If the same explanation is used to describe opposing outcomes, that explanation is wrong.

I.e. Why those people say they are doing what they're doing is definitely, definitely not the actual reason, not the whole story, NOT the motivating factor in their choices, but a rationalization.