I think it brings up some good discussion points.
My question is that whenever I'd had a passenger problem, call security to have the person removed and "de pressurize" the situation. Once the decision to make that call has been made, and trust me, I've made them, that's my last communication with an abusive passenger.
I've been called "all kinna" (sic) names, threats made, etc but once that decision has been made, I'd had my last contact with that person. No negotiating, no reasoning, no responding, absolutely nada. But you drop that first "f' bomb or use a scintilla of abusive language, party over.
In my opinion, just like moderating this damned forum, once you lose your cookies, we're done. Sure I'll occasionally get in the mud and "wrestle the pig" online but at work, nope. There's nothing in a disgruntled passengers rampage that's worth muddying myself for.