Splintered
unsavory tart
That and he knows it was stupid. Hope admits it, he just used Snow as an outlet because he didn't know what to do.I think Hope's blaming Snow comes from him getting other people, like his mother, involved in his fight. He might not have directly killed her, but he was (in Hope's eyes) responsible for her getting involved in the battle which cost her her life.
That and it didn't help that Snow has a remarkable of way of saying the wrong thing and the wrong time. Snow admits that he was running away from any responsibility of letting other people join in the fight, and when Snow showed no remorse for what happened it made it worse. I don't think it was Snow's fault either, but all those contributed to a kid who has just been thrown in a situation that he can't handle. So he acted irrationally. They all were.
Hope and Lightning were motivated by anger and the need to fight, Vanille ran away from everything, Snow was denial, and Sazh almost killed himself.