Okay, Dawn of Justice looks pretty badass, no denying. But many were wondering, why are two DC mega heroes fighting when the next movie clearly shows us they are on the same team (I.E. Birth of Justice = Justice League). Seems the official plot synopsis clears this issue up a bit for anyone wondering:
Fearing the actions of a god-like super hero left unchecked, Gotham City’s own formidable, forceful vigilante takes on Metropolis’s most revered, modern-day savior, while the world wrestles with what sort of hero it really needs. And with Batman and Superman at war with one another, a new threat quickly arises, putting mankind in greater danger than it’s ever known before.
Honestly, I don’t need any more reasons than “it is going to look awesome on film”, and I am pretty sure that is what all the execs behind-the-scenes were thinking.
(Image, H/T ComicsAlliance)