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Believe it or not, there exist some evolutionary theories on that. I don't remember the details but you may google them. Actually it might be beneficial for some groups to have some individuals outside of the group that is likely to pass their genes amd to serve other roles. I think there are multiple intangibles to it, certainly it is not trauma related. This is silly figment of imagination based on anecdotal evidence.
This is false as it is known that most of these people have not experienced more of it than straight people and you seem to display some prejudice.
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