8) He’s A Killer
He saw his parents killed as a child and was raised a lonely orphan, while at the beginning of Dawn of Justice we also find that he was witness to Man of Steel‘s destructive Supes/Zod fight at ground level, meaning he saw the merciless near-annihilation of a city and its people up close. To summarize, Bruce Wayne has been through a lot by the time we meet him in Zack Snyder’s film, which goes part of the way to explaining why he’s a killer now.
That’s right: in Batman V Superman: Dawn of Justice, the Caped Crusader has become a straight-up murderer. Where in Nolan’s Dark Knight trilogy Bats’ one rule was to never kill anyone, in BvS he shoots, stabs and explodes his enemies without a second thought.
There are no obvious feelings of guilt or remorse; to him, murder has simply become a part of his process. All the previous criticisms of Batman as a fascist in a cape apply doubly here.