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loki266: I am not arguing that he is a hero of justice. I am arguing that he believes that what he is doing is just in some way. Consider his talk with the old woman. Then consider his thoughts: "More people will suffer if she lives... so maybe this is for the best".
He believes that what he is doing is right. Pretty ironic, don't you think? He doesn't even consider the driver either. He doesn't consider the people that were drugged either. More likely than not, killing her off would just make it so that somebody else would take advantage of this scheme. He, however, seems to care only about finishing "the assault" as obvious by his actions. It's not like he doesn't have the means to fix all of these things, he simply doesn't care.
The issue here is that the MC deceives himself into believing that he's enacting vengeance in some way (which is reflected by his thoughts about the dead girl) and that what he does is "for the best", rather than accept the fact that he's on his way to becoming a bigger monster than all of his victims.