Why are intentional fouls (2 shots & possession) rarely called in youth games.

[Nevadaref]

I would say that things aren't done with such precision at the youth level because just as the kids participating are inexperienced and make a lot of mistakes so do most of the officials. It is likely that these people are good-hearted folks who are out there just to help the kids play. Most likely they don't know the specific details of the rules used at the HS and college levels, let alone the NBA. I know that when I was a little guy playing at the local Y, things didn't go perfectly, but I sure had fun.