Many times dark humor comes from a stress reaction. I had a suicide plunge right outside our office window 30 years ago. The whole office had “poor taste” humor for the next 3 months. Get the same in combat areas.
Yeah - I have trouble with the callousness of some folks, when discussin an actual human who was so tortured that suicide was their “best bet”, but a generic “Suicide is the ultimate in self criticism” doesn’t set me off....