What they deserve? It's a glitch, not our fault they made it.... Shouldn't have any punishment if you ask me, that's crap. I used it for 45 levels, am I gonna get banned? Doubt it cause my stats and everything aren't outrageous.
So according to your statement, If a shop owner accidently left his shop window open and a robber (i.e. you) stole everything the shop owner had, would you have a punishment? It wasn't the shop keeper's fault that he left the window open, but you still robbed the store. Now the owner finds out you did it and of course you should go to jail. Same thing with the Infinity Ward ban.