Well well well how the turntables. This manga is turning out to be pretty interesting. Knowing that someone will die and not doing anything about and even witnessing it, is almost the same as killing them. If someone did to me what the prez did to Seo then I would want to kill them too. Like who are they to play god. People can also change too.
However looking at it from the prez's view, Satsuki is just an annoyance who gets in the way of people getting what they might deserve....it's a clash of extremes where there is no winner if one side overpowers the other.
I do hope Satsuki saves the class though, even if Seo was bullied, she shouldn't take out the entire class. But I really wanna see Komachis pov, maybe the whole thing was her idea and Seo is going along with it.