See the reason MANY dont watch them shows as there is NO reason to kill the reptiles and or any other animal. The show is to SHOW you how to survive. That guy is NOT starving to where he HAS to kill anything on the show. When those cameras are not rolling hes got meals to eat.
Read the shows description as it says they will not let the people involved in the show to become in harms way. If one is in harm they will intervene with help(ie FOOD).