It isn’t rare for a good man to die like a criminal, but it’s not something he wants to see either. Perhaps it’s a demonstration on how no man is completely innocent from the law, but right now, he’s too upset to think of these things. So he sings a mourning song for the deceased, knowing people will take up his tune for his sake rather than the dead’s, understanding too that the past will always catch up to the present.
For now, he’ll have no part in anything but the here and the maybes, and stay as clean as he can be, even if it makes him seem weak. If he had to lose, he’d rather lose to his enemy than to himself, because what he knows now will eventually catch up to his future-present self.
He’d have stayed clean a long time ago, if everyone else’s past would just leave him alone.