It is widely believed that no one should be held morally responsible for an action if that action is not freely done.
Freedom is a necessary condition of moral responsibility.
The conception of freedom that makes moral responsibility possible involves both the idea that we control our choices and that we can choose differently than we do. Yet it seems that this type of freedom may be impossible. If determinism is true, we cannot choose differently than we do. If we cannot choose differently than we do, then we are not responsible for what we do. If indeterminism is true and our choices are not determined, then some of our choices are not under our control.