It's because of right-hand dominance.
Right-hand dominance occurs because of left-hemisphere brain dominance (our brains are wired 'backwards'), itself because humans developed language, speech, writing, etc which are all left-hemisphere dominant.
Did you know that there is AN ACTUAL STUDY about circle pits and how they rotate counter clockwise? It blew my mind, I could NOT think of a single pit I’ve been to where people are going clockwise (unless they are crowd killing or forming after a wall of death)