Batman v Superman Trailer 2

I know, I know, so many trailers lately. I apologize.

I definitely love Ben Affleck as Batman. He pulls it off. However, I am not sure how I feel about Eisenberg as Lex Luthor. I read somewhere that he is some kind of tech billionaire, like a Zuckerberg (typecast already?) or Musk. I am just wondering what is his motivation to want these two to battle.

Also, I like how the carnage wrought in Man of Steel by Zod is something that motivates Bruce Wayne to get back into the game and go after Superman. Could it be that Batman maybe teaches Clark something about being a hero?