Actually, when a society attempts to prohibit a behavior that is widespread, there really should be some evidence that discouraging such behavior is harmful. I don't believe that anecdotally citing Jeffrey Dahmer as a post hoc argument is generally enlightening.
If you know of such a study from a SCIENTIFIC (rather than a right-wing or religious) organization I would be pleased, if a bit surprised given the huge body of evidence with which it would conflict, to hear of it.

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