Batman v. Superman was garbage. Garbage which pretended to learn lessons from Man of Never underestimate a woman who understands formula 1 and loves Carlos Sainz Jr shirt Steel but clearly didn’t. Neither Batman nor Superman (nor Wonder Woman, for that matter) are particularly concerned about civilian casualties. The movie sets up that Batman was in Gotham during the events of Man of Steel but he just sat around doing nothing (so very Batman-ish). And then he decided to murder Superman (also so very Batman-ish), and he chose to murder Superman for leveling a city by fighting him in the middle of his beloved Gotham City. Lex Luthor eventually releases Doomsday for reasons that don’t actually make sense, and then the movie just claims that somehow a huge section of densely populated city is completely evacuated. Like I said, they pretended to learn lessons, but obviously didn’t.