  One issue raised in the above remarks is relevant to practical deliberation in general. To what extent should proponents of a given theory, or a given rule, or a given policy — or even proponents of a given one-off action — consider what they think people will actually do, as opposed to what they think those same people ought to do (under full and reasonable reflection, for example)? This is an example of something that comes up in the Actualism/possibilism debate in accounts of practical deliberation. Extrapolating from the example used above, we have people who advocate telling the truth, or what they believe to be the truth, even if the effects are bad because the truth is somehow misused by others. On the other hand are those who recommend not telling the truth when it is predicted that the truth will be misused by others to achieve bad results. Of course it is the case that the truth ought not be misused, that its misuse can be avoided and is not inevitable, but the misuse is entirely predictable. Sidgwick seems to recommending that we follow the course that we predict will have the best outcome, given as part of our calculations the data that others may fail in some way — either due to having bad desires, or simply not being able to reason effectively. The worry Williams points to really isn't a worry specifically with utilitarianism (Driver 2011). Sidgwick would point out that if it is bad to hide the truth, because ‘Government House’ types, for example, typically engage in self-deceptive rationalizations of their policies (which seems entirely plausible), then one shouldn't do it. And of course, that heavily influences our intuitions.