Why do many human societies morally condemn apparently victimless and pleasurable behaviors, such as lust, gluttony, drinking, drugs, gambling, or even music and dance? Why do they morally praise temperance, chastity, sobriety, decency, and piety? While this puritanical morality often appears as an exception to the cooperative function of moral cognition, we propose that it stems, like other moral concerns, from moral judgements targeting cooperative challenges. Specifically, we propose that it consists of preemptive moralizations of behaviors perceived as risk factors for uncooperative self-control failures, impeding people's ability to resist the short-term temptations naturally conflicting with cooperative motivations.