  Other utilitarians blunt the force of the demandingness objection by limiting direct utilitarianism to what people morally ought to do. Even if we morally ought to maximize utility, it need not be morally wrong to fail to maximize utility. John Stuart Mill, for example, argued that an act is morally wrong only when both it fails to maximize utility and its agent is liable to punishment for the failure (Mill 1861). It does not always maximize utility to punish people for failing to maximize utility. Thus, on this view, it is not always morally wrong to fail to do what one morally ought to do. If Mill is correct about this, then utilitarians can say that we ought to give much more to charity, but we are not required or obliged to do so, and failing to do so is not morally wrong (cf. Sinnott-Armstrong 2005).