Superman

When Batman v Superman was first announced (such a long time ago), it was supposed to be a Man of Steel sequel. Later on, it was revealed that the title is a bit longer (adding Dawn of Justice), and that the film won't work as a sequel, but rather as an introduction into the expanded shared universe. After the first trailers dropped, a rumor said that the Warner Bros. execs have decided to give Batman a bigger role in the movie (which is understandable, since he is their most successful comic book character). Lastly, the final trailer hit "“ completely Bat-centric.

Apparently, at this point, Superman is playing second fiddle in his own movie.

The trailers make it pretty clear why he is so keen on taking Batman down. According to him, the Dark Knight shouldn't use so much violence when apprehending criminals. It is a lesson he himself learned in Man of Steel (and one he will, apparently, forget by the third act of Batman v Superman). So he intends to take the Dark Knight down. At first, only with a threat "“ later on, using brute force.

It seems a bit out of character for him to issue threats such as the bat is dead, bury it, or for him to actually try to punch an armored Batman with all his might. What would have happened if the Mech suit failed?

And that is why we believe that he is under the influence of Kryptonite or some other substance that clouds his judgment. After all, he seems to be too pissed off in the trailers (or, at least, this is how we see him). Does Lex Luthor use some Kryptonite on him? This could be it, though it seems too thin a theory.

Do you have any other thoughts as to why Superman goes all-out against Batman?