seems like youre one of those jerkoff parents that sit there and watch every practice.... i ran into people like you when i used to coach midget football.. trust me, the coaches hate you... even butted in to "help"... lol, go the fuck home and stop worrying that your son is going to be a pussy and get his ass kicked like you used to.
I agree with the sentiment, but not at ages 5-7.
I started as a dad coach, and when I was done I was talking to college scouts about kids, so I've been through it all.
At those low ages, it's fine if they're there, and if they offer to help as well.
Once the kids get a bit older though, they do certainly need to fuck the fuck off and stay away. It actually helps the kids develop.