I saw some parts of the show with Bear Grylls in the German version. At the start they clearly state that it is a show and especially the more dangerous scenes are staged. So it would not be a real problem as long as people keep that in mind.
When watching carefully there are some points that are suspicious. For example he finds a rotting carcass of a goat in bear country. He states that he wouldnīt want be there when whatever ate there is back but still takes parts of the skin and fat in his backpack. On several occassions he jumps into pools from considerable height (about 20 feet) after claiming that he cannot judge whether the water is deep enough and just hopes he will not get injured.
In conclusion I would think that most of that show should be taken with a liberal dose of salt. No matter how well trained and competent Bear Grylls may be it is just a show.
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If it isnīt broken, it doesnīt have enough features yet.