  Many defenders of (HPP) offer defences that proceed in the manner just described. One error is that of underestimating the value in lives very different from our own: of mistaking the virtues required to succeed in those lives for vices, and of concluding that these supposed vices ought to be suppressed (Raz 1986, 401–407; Gardner 2007, 118–120). A second error is that of underestimating the value of toleration. That value includes making space for experiments in living, which both help combat prejudice by exposing people to the unfamiliar, and help people develop deliberative faculties by exposing them to that with which they disagree (Mill 1859; Brink 2013). A third error is that of underestimating the harm one’s policies do to those who live in very different circumstances (Green 2013b, 202). If the main effects of criminalizing drug use are felt in communities the affluent shun, it is not hard to see how law-makers could be blind to the amount of damage criminalization does. Law-makers who make each of these errors will be tempted to create criminal laws that are anything but impeccable—laws designed to suppress activities the value in which has been missed, which do much more harm than their designers anticipated. The case for (HPP) is that it stands in the way of this temptation. Those who follow it must tolerate conduct—however offensive or immoral they deem it to be—unless they can show that criminalization is a necessary and proportionate means of preventing harm.