You're funny.  You're bitching about somebody who was sent 500BTC in error and cashes it in, when you're completely glossing over the GLARING FRAUD everywhere else on these forums.  This isn't a scam.  There was no confidence game played here.  This is a programmer's gross negligence come back to haunt him.

If you want to stop scammers, then you should be haunting all of the yes-men who're playing the speculative pump-and-dump schemes, and the pyramid scheme operators and exchange operators who disappear overnight or "lose" half their value.  There's the real scam.