Earlier quoted context omitted.
Bragged about killing. Nope. That’s how you know he didn’t see any shit.
This is one of those rules with essentially zero exceptions. Nobody that's telling the truth ever brags about that.
I strongly suspect there are exceptions to this rule. At the very least we know there exist people in prisons today who enjoy murder. Arguably that's very different since (I assume) 'enjoying killing' and 'enjoying getting shot back at' are worlds apart. But, would it surprise you if there was a small minority of drone operators who genuinely enjoyed their work?
Then again I suppose (hope) the modern military system might select against that kind of mindset.