A couple weeks ago, I wrote about how some left-wing organisations act like churches–they are communities in which people come together to develop and refine their understandings of the good rather than strategic operations for achieving discrete political goals in the world. A few people wrote replies to my piece. The most interesting and recurrent counterargument I saw alleges that it’s fine for the left to be a church because people enjoy the sense of community churches provide and like the opportunity to come together with like-minded people to develop their understanding of what it means to be good to one another. These people deny that we ought to prioritise strategic efficacy, that it’s at least as important to become good people, and that left-wing organisations facilitate this personal growth. I disagree with this priority on the personal because I think it’s egoistic. But today I want to make an additional, larger argument–I want to argue that churches and other communities are not good devices for pursuing the good, and that the conclusions communities reach about the good are very likely to be deeply wrong.