This chapter discusses abolitionism and considers whether there is a more general case for extremism in any of the three forms – ideological, methods and psychological. Extremists and fanatics tend to be radicals but not all extremists are radicals and radicals need not be extremists or fanatics. There is something to be said for the idea that radicalism and moderation can both be corrective. Moderation can be an effective antidote to fanaticism and extremism, and we are more inclined to admire moderation where fanaticism, extremism and radicalism of the wrong sort are the main threats to our well-being. Where extremism is on the rise, or we are in danger from the excesses of fanaticism, moderation has the feel of a corrective virtue. In the same way, radicalism is an antidote to moderation and has the feel of a corrective virtue in circumstances in which moderation is an obstacle to progress.