Since we’re a social species, it is intelligent for us to convince ourselves of irrational beliefs if holding those beliefs increases our status and well-being. Dan Kahan calls this behavior “identity-protective cognition” (IPC).

Rather, cultures are mental parasites that emerge accidentally, and thereafter take advantage of all people infected by them. This approach is sometimes called memetics. It assumes that, just as organic evolution is based on the replication of organic information units called ‘genes’, so cultural evolution is based on the replication of cultural in