Even assuming perfect selfishness, sometimes the best way to get what you want (X) is to coordinate to change the world in a way that makes X plentiful, rather than fighting over the rare Xs that exist now, and in that way, your goals align with other people who want X.
Even assuming perfect selfishness, sometimes the best way to get what you want (X) is to coordinate to change the world in a way that makes X plentiful, rather than fighting over the rare Xs that exist now, and in that way, your goals align with other people who want X.