HyperMotard i've been riding 27 years... longer than you've been breathing no doubt...
The amount of places i've seen shut down, the riding areas shrinking and shrinking, or the country side burnt to a cinder, due to idiots either riding with no mufflers, or riding where they shouldnt be, would make you shudder...
it's people like your mate, that cause tracks to be shut down, or increased police presence where once upon a time, we were free to roam, as we werent hurting anyone but ourselves...
So yeah, every time i hear about an idiot like your mate without the muffler, or hear about some kid who thinks he's gangsta cause he tears up the local park on his pitty, unlicensed, scaring the bejesus out of the mum and kids trying to enjoy the swings, damn right i get pissed off and start yelling...
How many riding areas do you think you'll have in ten years time?? Hopefully when your unmuffled mate sells his bikes up, due to lack of places to ride, you both might feel a pang of guilt, and reflect hmm, perhaps we should have made a bit more of an effort to ride legally, to ride quietly, and encourage others to do so as well... we might have somewhere to ride...