Re: Should Batman be portrayed as a Protagonist or Antagonist in this film?
Batman is paranoid and distrusful by nature. It's one of the big contrasts between him and Superman. Batman tends to be instantly suspicious, cynical, and distrustful of people until they prove themselves to be trustworthy. Superman, on the other hand, tends to be optimistic, open, and want to believe the best about people. From Batman's perspective, Superman is a god-like alien who's been hiding on Earth for decades and as soon as his activities start to be known, another group of god-like aliens show up, members of his own race no less, and begin wreaking havoc. Heck, Batman would probably think that Superman being so powerful on it's own makes him a threat (should he ever lose control and try to take over) no one could stop him. And there's established precedent for that happening with Zod. Batman doesn't need Lex to manipulate him into distrusting Superman, he already will.