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Some are. But not all.
Terrorism is basically a method, a tool. People who use that method are quite diverse.
But how many? It seems more likely that most terrorist have shitty lives and got exposed to a dangerous and bad meme. The alternative would be that there is a certain genetic demographic that is predisposed to committing terrorism, sounds far fetched. If Christians during the crusades had modern technology 1000 years ago, we would probably have seen the kinds of solo terrorism we see today. It was really hard to be a lone fanatic trying to kill 10s of people back then with a blade.