The world is in a terrible mess. It is toxic, irradiated, and full of injustice. Aiming to stand aside from the mess can produce a seemingly satisfying self-righteousness in the scant moments we achieve it, but since it is ultimately impossible, individual purity will always disappoint. Might it be better to understand complexity and, indeed, our own complicity in much of what we think of as bad, as fundamental to our lives? Against Purityargues that the only answer—if we are to have any hope of tackling the past, present, and future of colonialism, disease, pollution, and climate change—is a resounding yes. Proposing a powerful new conception of social movements as custodians for the past and incubators for liberated futures, Against Purityundertakes an analysis that draws on theories of race, disability, gender, and animal ethics as a foundation for an innovative approach to the politics and ethics of responding to systemic problems.