Actually Disney owns the History Channel etc. So I guess you discredit anything on History Channel without looking? Again it's pointless to judge a documentary based on the host or channel and not on its content, that's the point.
Nobody is asking you to trust everything any say, they have a series of guests, scientists and even just average people on the corner. Of course you don't trust them without research, but the same goes from ANY source, and immediately discrediting the info based on the corporation or host is pretty pointless.
Also being a wrestler, governor, and navy seal, is hardly discrediting. As for fluoride, the people pushing the idea it's safe in water, are those selling it.. It's actually illegal/banned in many countries from being added to the water due to the health factors. Plenty of natural fluoride comes from your food and anything you drink, adding more into drinking water toothpaste etc. only adds to the quantity and it can easily reach beyond safe levels, specifically in children.
BTW Disney also owns ABC and its affiliates, The History Channel <http://en.wikipedia.org/wiki/The_History_Channel> The Biography Channel <http://en.wikipedia.org/wiki/The_Biography_Channel> History Channel International <http://en.wikipedia.org/wiki/History_International> Military History Channel <http://en.wikipedia.org/wiki/Military_History_Channel>, Lifetime <http://en.wikipedia.org/wiki/Lifetime_%28TV_network%29>, Buena Vista Productions, HBO, ESPN, etc. etc. etc. So if you start elimnating your sources based on the company, in specific Disney, your options will become very few very quick... only about 5 companies own all media channels (arguably 6)