Aaron looked at the sentence and considered changing the senior class president but Aaron didn't really hold any good or ill will towards her since they never really interacted. Likewise changing all the faculty was a bit heavy handed to test things. Though there were some teachers who really seemed to care about teaching and others... Well, he wouldn't mind if they were replaced. Doing the same thing to everyone would also give him a lot to fix if it did something wrong.
The "peers" reference was vague as to who its actually targeting, those in his classes? His grade? All the students registered at the school, even if they called out sick today? Just the students at the assembly? Like with the teachers, there were some he'd want to do nice things for and others he wouldn't bat an eye if they turned into... well there were plenty of options if he wanted to be mean. But again, it was personal and doing something to potentially every student wouldn't suffice for doling out the good or the bad.
Realizing he had eliminated using the sentence completely, he clicked the button again to spawn a new option, hoping it would focus on someone he new and cared about, either a friend or a bully.