 Mobs are often thought to be the last groups that we should be tying to hold collectively responsible. For, they completely lack decision-making procedures, their members are seemingly not related, and they are often chaotic and irrational. But, Larry May (1987), Raimo Tuomela (1989), and others argue, we can nevertheless hold mobs collectively responsible if at least some of their members contribute directly to harm and others either facilitate these contributions or fail to prevent them. For, in these cases, all mob members are “implicated” in mob action, even if not all of them produced specific harms or organized together to do so. Tuomela (1989, 2005, 2006), much like Le Bon (1896) before him, argues that both crowds and rioters are appropriate sites of collective responsibility by virtue of the fact that they perform their acts as members of a group, even if they do not think of themselves as doing so.