I agree with Tim T, if the coach has his second team on the field then he should allow them to play their best and score if they can. For some of those kids it may be the only game they get to play in all season. So why hold them back.
I have 14 years coaching experience in football up to and including the middle school level. I have had teams that have scored alot of points against me and I too have scored alot of points on other teams. Guess what happened to the kids? Not a thing. Parents get more upset about it than the kids do. Most of these kids are out here tho have fun. It is the parents who actually ruin it for the kids by complaining about crap like running the score up, complaining about refs, and complaining about coaches. Let the kids play and if they lose so be it. Guess what? Thats life, get over it.