>>117973504Batman doesn't let him do it even now, under Lobdell's shitty writing. There was a whole thing where he ran Jason out of Gotham. But he won't lock him up, because Batman is nothing if not perpetual guilt over past mistakes.
As for why won't he kill big name rogues — you can ask the same of Marvel heroes, most of whom have no problem killing. Like
>>117973542 said, it's all about editorial.