As a coach I've now seen both ends of this spectrum. Teams learn nothing from being humiliated, and gain nothing(except artificially padded stats) from killing a team just beacuse they can. Personally, I will never let my team score double digits, and often won't let the score go past 6-0. Put in the JV's AND place restrictions on their play. It also helps that we've been on the down side of 12-0 before. We know how bad that feels. I tell my players, "You can't make others play with class. Just show that you do."