Please, let us use correct grammar: the proper word here is “hung,” not “hanged.”
Thus: Bergdahl should have been hung.
I believe the correct term is hanged. He may have been hung, for all we know.
It’s not too late!
You are the one who is incorrect. It is proper to say “hanged” as the poster did that you so incorrectly corrected. Cheers ;)
https://www.dailywritingtips.com/hang-hung-hanged/
Thus: Bergdahl should have been hung.
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That’s ok with me, too! :-)