At first I'm thinking which one is 'more right' between President and Satsuki:
Satsuki: I'm going to save them with the best of my ability because it's the right thing to do
President: There's a death count. if someone needs to die in the first place, why not someone who deserves it?
Then I thought, why is there a 'death count' at all? where did it come from? does it center itself only within a certain place- the school, or japan? how do you even 'count' it? Why can't they just orchestrate someone from outside the school to die? There are murderers, rapists and abusers out there who actually deserve it, why don't they branch out their plans?
This is just my theory, but i think the 'death count' (not aptly named since i don't know what else to call it) is something similar to 'Walk to Death'.
is it Komachi? She's the first girl to die in chapter one. and the author seems to be putting a lot of foreshadowing(?) on her. I don't think so. She may be first girl, but Satsuki has long had her reputation even before chapter one. So she must have saved several people beforehand. The long and short of it is that every victim of the 'death count' seems to be connected with each other- acquaintances, friends, or work closely with one another. Most have worked together in the student council, clubs, been in the same friend groups, or in the same class, etc.
To me, it all boils down to one person, or one reason why the deaths have been happening at all- the president. His rationalizations have become increasingly... irrational. I think what's coming out of his mouth are not his true reasons. I think he's doing most of this out of heavy guilt. guilt of not protecting his friend sooner. guilt of not having the courage to do sooner what he had inevitably done in the end after all. His actions to this day feels like he's protecting someone. And i think it's the vice president that needed to die in the first place- she is the root of the 'death count'. it had spread to the others like a disease when she didn't die.