on the other hand, Aristotle was happy to defend slavery on the fit only to be the tools of others. To ask for

This principle has been vigorously contested. Fitzjames Stephen, one of Mill's severest critics, roundly declares:

In considering whether a rule is justified, we have to ask whether the over-all consequences would be bad if the type of conduct it pro-* Elsewhere Mill accepts this view of justification of the particular instance. But he does not make this distinction in the essay On Liberty.