Now it's clear that Satsuki's motives go much deeper than a simple moral code, different from the twisted, distorted and edgy moral code of that asshole president
Imagine you are Satsuki, your mom died while you know you could have done something to prevent it, some asshole on your school watched death note and started basing his whole personality on Kira and went berserk killing people, sabotaging you when you try to save them and going around saying on your face that "some people deserve to die" while constantly trying to get you to "his side"
It just shows how different is the view of someone who really suffered a loss VS someone who has never suffered a loss and does not value the life of anyone, unless it's someone close to him, all to massage the inflated ego he carries in his back