I've never seen any kid execute proper technique on every snap during a game. So at what level of execution do you decide a kid Shouldn't be on the field? If they can't execute 60% of the time? 40% of the time? Plus, I've seen instances where the more talented players displayed poor technique because they are trying to show a "sportscenter top 10" move or tackle. But the coach never pulls that player out for a "safety" reason. Wonder why?!?
You're right, football isn't for everyone. But this thread is talking about pee wee, not high school and beyond. If a kid wants to play pee wee, the kid should be allowed to play (and not just watch from the sideline the whole game).