In all fairness both shows are for entertainment. They wouldn't be made and aired if they weren't for the networks to make a profit.
I happen to like survivorman more than man vs wild - simply because I think bear grylls is an idiot and I can't stand the way he says some words.
However, they are both just tv shows. I've seen survivor man kill rattle snakes and other predators on his show too. And he doesn't have a camera crew but he can call in his crew to come get him if he thinks he can't go any further - so he doesn't really need to kill to survive either.