Sticks and stones may break my bones but all that other stuff is going to kill me...or you. In Dakota's mind there are only two options; shoot her bully or take her own life. If she does it in the crowded cafeteria they'd both pretty much have the same effect. Either way the witnesses will be left with a horrific visual and undeniable guilt that will serve as a reminder for the rest of their lives. At the end of the day it doesn't matter, it's going to be a tragic end and West Chase High will never be the same again.