Batman V. Superman rumor

If it's true it ruins the follow up material since it seriously screws up Bruces' character.

SPOILERS/Rumors AHEAD


Apparently Bruce is okay with killing, which is already WTF worth when he's in a battle of supposed morals against Superman. But Jason Todd is supposed to be in the movies which begs the question of HOW their conflict works if this is true. If Bruce is fine killing why doesn't he kill the Joker?