Perfectionism in Mill's On Liberty

Read this article, which attempts to reconcile the tension between Mill's principle of liberty and his invocation of utilitarianism. The difficulty lies in that the principle of liberty disqualifies utility-promotion as a reason for restraint of liberty, unless such restraint also prevents harm to others. Yet at the same time, once the harm-to-others threshold presented by the principle of liberty is crossed and liberty-limitation is justifiable, it becomes justified according to the balance of restraint of liberty and prevention of harm as assessed by a utilitarian calculation. By appealing to perfectionist tendencies in Mill's thought, and particularly his notion of "the permanent interests of man as a progressive being", the principle of liberty can be seen less in the light of problems with regard to utilitarian calculation and more as an indispensable pillar for what Mill would have us aspire to be both as a tolerant society and as autonomous individuals.