The Aztecs made human sacrifices in order to attempt to avert the end of the world. Depending on what motivations (for instance, status-seeking behavior, perhaps forcible sacrifices, etc) you ascribe to them, this may or may not have been purely altruistic.
Many other religions and cults nowadays try to increase the fertility rate among their members so that in a few generations they will have taken over the politics of the country they’re based in. This may or may not count, depending on how much you’d like to hold them to utilitarianism. Though, note, if a big reason why they do this is because of all the people sent hell for sins, then they are using utilitarianism (despite having a terribly inaccurate world model).
The Aztecs made human sacrifices in order to attempt to avert the end of the world. Depending on what motivations (for instance, status-seeking behavior, perhaps forcible sacrifices, etc) you ascribe to them, this may or may not have been purely altruistic.
Many other religions and cults nowadays try to increase the fertility rate among their members so that in a few generations they will have taken over the politics of the country they’re based in. This may or may not count, depending on how much you’d like to hold them to utilitarianism. Though, note, if a big reason why they do this is because of all the people sent hell for sins, then they are using utilitarianism (despite having a terribly inaccurate world model).