There are millions of people dying, so Superman killed thousands to save the rest. It will all come to Perspective....
Batman v Superman: Dawn of Justice Marvel Wins.
Superman Kills Green Arrow (Injustice)
Batman v Superman Kill it at The Box Office
Batman /// Seriously, he'd have to be a Time Lord to have enough time to learn all that, unless he went out and just bought the degrees.
Superman Kills Mogo And Ganthet
Superman Kills Some Random Old Man
Superman Kills Mogo And Ganthet 4
Batman Vs Superman Logo Adapted For The Rest of DC Comics
Superman Kills Black Canary (Injustice)