If he wanted to stomp it, or if he HAD to stomp it, why did he have to do it at the field? He could have taken it home and done whatever he wished to do. And what about the servos RX and batteries? Did they suck too? Personalty my take on something like that is to take it home, gut the servos, radio, motor etc. Then go all mental on it if I wished. But I have about three or four 10,12 year old kids that like to watch me load the van with my planes. I'd rather give it to them to play with for a bit. Maybe they would be like me at that age and wonder how it was put together.
Yup, it's his plane and he can do what he wants. Hope he got some enjoyment outta it....