For while he is a controlling figure, and the only one who seems to have command of himself, he is filled with doubt about his move from social action to economic enterprise. I'd rather break free of the addictions, thank you. In the sense that people are incapable of change, Hare is saying that recovering from addiction may well be impossible. It is rather an affirmation of human frailty and futility. While I agree with Hare that addictions to substances serve such existential functions, I do not share Hare's existential pessimism.
People can overcome addictions, just as they can improve their place in the universe.