Before we had kids, some neighbors invited us to go watch their 5 and 6 yr olds play soccer. We figured, what the heck, and we went. We were amazed by the intensity of the parents on the side line. About half way through the game the whole thing turned into a brawl between the parents of both sides, right in the middle of the field. The ref got a broken nose.
After the melee, I said to our neighbor, “That was pretty good, what do you do next week?” We never went again.
Our kids did swimming and gymnastics. Much nicer sports.