Rittenhouse has a hero complex, and can't accept he's nothing more than a deranged little shithead everyone knows is just a murderer that got away with it.
No one likes him, not even the right. The right used him when he was useful and then threw him away. How sad and pathetic that those were his "best" days, and they are behind him.
He'll now try to regain his "glory" days by reliving that time he murdered innocent people. And hopefully this time he's put away for life.
Unless you die at the age of 32.