What really should happen is that if two parties can't or won't agree or compromise, that the total cost of shipping and/or repairs be split, and each person takes a hit on that total. There's no other way without irrefutable proof. You could write it into the rules of asc's exchange sections(s). People who don't want to abide get banned. It's true what Poncho said though, people get so put off by dealing with dishonest people that they often prefer to just walk away, even quit airsoft altogether. In that case, there really is nothing left but court.
As to little firemachine, the whole thing really has nothing to do with you so give it a rest. And who 'called you on' or picked a fight? I made no threat.
Read Stephen Taylor here
Those who trade liberty for safety will ultimately deprive themselves of both.