A control principle connects blame with what someone could understand, choose, or influence. It asks whether holding an agent responsible is fair when a relevant feature lies beyond their power. Control comes in degrees and can concern an action, a foreseeable risk, or later opportunities to respond.
Control has an informational side and a practical side. Someone may have authority to stop a process but lack the knowledge needed to recognize its danger; another may understand the danger while lacking authority to intervene. Responsibility can also concern failing to acquire information when a role required it. This makes assessment sensitive to reasonable expectations and available options. Asking what the person could actually know and do is more useful than assuming unlimited foresight or power.