Okay...time for me to play devil's advocate here.
Okay, it's Haley's Story, however that does not mean that all of the endings are necessarily happy ones. I would submit that violence is all too often used to solve such problems in real life. If we are to embrace the notion that only Haley's opinion matters on the subject, we would have just moved on and ignored the situation with Klaus ever happened, because that's what Haley wanted. The problem is the MC is guiding the story, so if we can ignore her wishes about Klaus it also means that an option for violence isn't outside the realm of possibility.
THAT SAID...I wouldn't be surprised if violence is used as a solution to the problem that the MC be arrested and jailed resulting in a bad ending. Then you reload from a previous save and make different choices (like not resorting to violence). Trying different options in games is part of the fun.