This is a sensitive topic, so I hope I don't give offense.
To the LEOs:
I understand that it can be traumatic to take a life, but I wonder something. You see some of the absolute dregs of society -- people who really are inhuman in their treatment of other people. It is one thing to say that you don't want to go through shooting someone (paperwork, investigation, paid leave, vilification in the news and by "community leaders" ), but given the people you sometimes arrest -- real scumbag crapwads -- do you really think that you'd regret so badly having to dispatch one due to his own criminal action? Wouldn't you feel that you had done humanity a favor? Saved a few lives by ending one really loathesome one?
I ask this with honest curiousity, not seeking to challenge anyone. But I guess that for those who are LEOs here, it might not be wise to publicly post, "Yeah, I'd love to off one of these sumbitches..."