“Nobody understands me,” Norman says over tea at a crowded Barnes and Noble. We’re nearing the end of our conversation, and the fervor with which Norman had previously discussed his politics and explained his one-man show about the life of the controversial abolitionist John Brown has subsided. “But of course nobody understands me,” he says. “I don’t understand anybody else. I don’t care about anybody’s life, but I want everybody to care about mine. It’s…