then there is interactions with darksied in the DCAU. supes doesn't kill willingly or if he can help it. a few times he was tempted into just vaping lex into ash like the justice lord superman but he doesn't. darksied is different. not only did he murder one of supes' closest friends in front of him but he brainwashed him and turned him on earth to the point where the world lost their trust him and another of his close friends came to fear him and join a group dedicated to bringing down him and the JL. clark hates darksied with a passion and is the only villain that would push him to out right murder. that's character development.