Does anyone else think this isn't safe?

My wifes grandfather split 4 to 5 cords a year for as long as I knew him with one similar to that and lived to 83 yrs when cancer took him. His was on a tractor PTO but it did have a safety switch on a cord that hung nearby (usually from a hitch arm on his tractor). His wasn't really an agressive enough screw to grab human parts but it sure did grab logs......