Anyone who believes this should be forced to watch the Mythbusters water-boarding episode
And in all honesty, I might be picking a tame "bad tactic". Cruel minds throughout history have devised plenty of horrible, awful tactics. Didn't we basically all decide gas attacks were a really shitty thing to do after WW1? Tons of weapons and devices have been invented not to kill, but to inflict pain and trauma on such a level that you never really recover.
Yeah, I'm probably sperging out pretty hard over here, but out of all the lines in the SJW bible, this one gets me the most, because it's so wrong and so stupid that I could probably ask a classroom full of first graders if there's such a thing as an "always bad thing to do". Betcha anything they'll come up with assault ("hitting people!"), stealing, lying, that kind of stuff. Hell, they might even say that pooping your pants is a bad tactic.