A belief that people can change bolsters their movement. Howard Keller would like to get out of Joliet Prison someday. If he did get out, he’d like to go back to Chicago and buy a pair of hair clippers. Then he’d open his own barber shop. He’d like to tell folks what he’s learned about alcohol abuse and addiction. And if he only got the chance, he’d like to say he’s sorry and ask for the opportunity to start again. “I did something wrong,” Keller would say, “and I’ve made all the efforts I can to change my life. Can…