I think you're taking it too serious. He has killed, and, well, you're dismissing it because you didn't like the comic, or you don't like the Burton films. It has happened. And since DC Studios is making it, they have to okay it, I don't see it as a big deal. They have alt universes with different rules, etc.
I have no idea what happens in BvsS. I have not seen it. I guess it's just not for everyone.