Always yell with the crowd. It's the only way to be safe. Being a minority, even a minority of one, did not make you mad. Even a back can be revealing. Everyone wants a place where they could be alone occasionally.
Freedom is the freedom to say that two plus two make four.
If that is granted, all else follows. He is a lonely ghost uttering a truth that nobody would ever hear. A hierarchical society is only possible on a basis of poverty and ignorance. Nothing is your own except the few cubic centimetres inside your skull. One is never fighting against an external enemy, but always against one's own body.