TheGodling
Los Ingobernables de Sala de Cine
Bruce wanted to kill superman because of the chance that he could wipe out humanity correct?
So what changes upon learning he has a mother?
He thinks Supes has zero attachment to the planet or the human race and is in fact completely detached from human life, which is his reason for believing that he could turn on us any time. It's not just learning Supes has a mother, but that he has a legitimate fear for her life, which breaks Batman's entire conception of what he thinks Superman is. That's what stops him from killing Supes, after which he learns Lex was the one manipulating him thus realizing Supes had been set up as much as he was. It's not that difficult, breh.