This is a segment of a Screen Rant article I wrote a couple years back about the worthwhile aspects of the DCEU:
THE DEVELOPMENT OF BATMAN
Bruce clears things up from very early on: “We’re criminals, Alfred”. DCEU’s old and worn version of Batman doesn’t hesitate to mark, cripple, even kill his foes. But, there is a parallel with Nolan's films that can help us better understand where he’s coming from.
Harvey Dent memorably quotes in The Dark Knight: “You either die a hero, or live long enough to see yourself become the villain”. And what happens at the end of The Dark Knight Rises? Batman either dies or quits, leading a normal life somewhere in the Mediterranean, while crime still rages on in Gotham. In that respect, Batman V Superman can be viewed as an alternative sequel to Nolan’s films, illustrating what could become of Batman, had he stayed in Gotham and been eroded by its everlasting evil. “Twenty years in Gotham, Alfred. How many good guys are left? How many stayed that way?
It’s his long exposure to corruption and tragedy that makes him see the worst in Superman, and blinds him to the good he’s been doing. To Bruce, Superman is a threat, a faceless enemy. With apocalyptic visions of what the Kryptonian could become if he broke bad clouding his judgement, Bruce decides to terminate him at any cost.
That is why the “Martha” moment is so fundamental. Realizing Superman’s humanity and vulnerability changes Bruce, awakening his buried empathy and reminding him of who he once was. Inspired by Superman’s sacrifice, he will helm the Justice League and fight for the greater good again, instead of his own obsessions. He has a newfound legacy. He has gone full circle. Read the full article here.