Clark notices Superman is upset about Lex’s kidnapping and brings up the philosophical quandary about whether or not you’d kill Hitler as a baby to save millions of lives. Anybody who would do that is practically Hitler themselves! How could somebody kill a baby?! Especially when you’d have to live with the knowledge that you killed an innocent baby that never did anything to anybody (at least not yet). If it were up to me, I’d go back in time and give Hitler’s mother an abortion!