User blog comment:Halley/Superman crosses that line...again./@comment-18172179-20170511023102

Trinity War, as of now, is four years old already. It was one of the many issues that the Superman from New 52 had with characterization and since Rebirth, it has been reverted back to the status quo.

And to address the elephant in the room; it seems you don't know Batman very well. His most important priority, in any case he has ever faced, is to save lives, thus his most important rule is "Never kill". That said, this was not always the case, as for the best part of the Golden Age, Bats had no issues with killing and in various modern stories, he has let crooks die with no remorse. But that's not to say Supes is clean either. If someone were to check Supes' history, they're are bound to find just as many "Batman victims" on his tally as well.