Fast-forward to the point of actual space colonization. Should mental stability be a factor in survival in space I can imagine that it'll introduce a rather strong darwinistic filter. It's difficult to fathom but realistic that folks with a short fuse have a severe disadvantage. Would it be required to undergo a psychiatric test before you can buy a ticket to an off-world colony and settle? Will people with a genetic predisposition be advised not to have kids? Will earth be a safe-haven for loonies?
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