2. Batman and Superman don’t kill (I know, I know, yes there are exceptions but in general no they don’t) and DC is never going to pick Diana’s side over theirs, so when she kills she frequently is made to look bad to demonstrate how wrong her actions are. So it’s just more dumping on her to prop them up, because if DC says “well killing is ok
sometimes”, the flimsiest shred of storytelling logic holding together Batman’s world breaks. Joker should be dead and the real reason he isn’t is DC wants to keep making Joker stories. If you say killing is ok sometimes, there’s no reason for DC to not let Batman kill the Joker, so that won’t ever happen.