Rick,
He didn't screw up stringing the bow, read the ad, he and his dad killed many deer AND fish with that 26# bow. So he must know what he is doing right??? 26# hunting bow strung backward..maybe it even has a new FF string to boot. Would you want to be the next person to own that bow? would you feel comfortable shooting it??, not me, that's my point. Not the original build quality of the bow, just the countless years of abuse by people like this guy who just happens to show everyone just one way he abused the bow.
For any used bow, I think I'll stick to buying form known guys on this site who have good knowledge of their equipment. Accidents can still happen, but it will not be because they abused the bow previously.