If Batman hadn’t brought Lois Lane to the battle, you can bet Superman would have killed all the other heroes, and who knows what he might he done to the rest of Metropolis.
Just like in the comics, we have Doomsday to thank for Superman’s death in the DC Extended Universe.
Superman died carrying out that noble act, but a year later, he was brought back to life by the newly-formed Justice League to help them defeat Steppenwolf.
Fortunately, he calmed down following a trip to goo ol’ Smallville, and after acquiring a new costume, he flew off to Russia and helped save the day.