Well, that's one reason I haven't put it up for public consumption. There are some fics you write to share with others and some which you write simply to excorcise your own rage issues inner demons.
You're missing my point. It's not about what she did or whether she got away with it. It's challenging the widely-held assumption that killing is the ultimate do-not-cross line.
That is the only way any superhero would let anyone get away with something like that before beating her within an inch of her life and dragging her to Arkham.
Yeah, because this works so damn well with the Joker. Also, IMO, beating someone within an inch of their life is not that much better than killing them. I wonder how many times Batman has caused some unlucky thug permanent damage that way.
There isn't just one clearly defined line that ensures your moral purity, especially if you're working as a vigilante. Sometimes you need to destroy in order to protect, and that means making tough judgement calls about life and death.