Simplifying key parts just ignores key elements. Batman has killed in almost every single live action interpretation and Batfleck’s version actually wanted to introduce that aspect of Batman who was so deluded that he can’t see what he’s doing and is so blinded by rage. Superman not being the Boy Scout because of the fact he’s constantly being framed for things he didn’t do and the nationwide opinion on his is that he’s either a force for good or he’s here for evil, isn’t exactly unwarranted. He wanted to try and be hopeful but when the world is so bleak, Superman not being sure isn’t surprised. Snyder gets both of the characters fine, he just wanted to take them in an different direction.