It seems like we hear that a lot. "He was such a nice (or quiet) man", until he raped and killed all those children.
Interesting question. Makes you wonder if given the right conditions all of us could have that switch thrown.
I think the answer is yes. But we don't always hear "he was a nice, quiet man" with shooters. A lot of times we hear "we always knew something was off about that guy."
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