Kenny isn't the kind of guy to give up and let things happen, for no reason. Not even having the daughter of the man who's head you are about to smash in being present is reason for him to not do what has to be done. He is a fighter in every aspect, especially fighting to defend the 'pack' he became a part of.
So this is not suicide, this is Kenny's last stand. And he knows going in he either survives or dies, but he will have done that fighting for the people he defends.