And what's wrong with making him pay for it? Getting the part sanded/repainted will take a couple hundred, but if he's old enough to procreate, drive, vote (I assume that's true up there in Canadia), serve in the military (ibid), then he can work, dammit!
I'm not sure anything else will teach him to be responsible for his actions. Well, I guess he could get some local eskimo gal knocked up....