I am one of the idiots that keep falling from walls/stairs/ladders, whatever is above ground level... ;-)
During combat, or just because I don't mind my step.
That I am hurt by that or even die when I walk off a high wall, - is ok.
That (esp. at low levels) a jump from a small hut kills me, is not.
In addition, the penalty for "alleged suicide by falling" is one killpoint, same as for a TK - bit hefty, me thinks.