It's still all assumptions.
See that is what I am getting at. Movies like Food Inc are good for making people think, but the problem is it causes people to start going off of other people's opinions with no facts behind it. Personally I don't even eat fast food beef all that often, nor do I eat pre-packaged beef patties (which is where this ammonia treatment is, most of the gound beef you buy fresh at the store is ground by the seller or their distributor, the stuff they are talking about are the cheap pre-made patties). If you don't want to eat it that is fine, but movies like Food Inc has made regular people think that they are experts in food safety, the biology of animals, and so on, when in reality they are mainly going off the opinions of others with no hard facts to back them up other than "1 company uses it, so they all must" assumption.
Personally, I care to only make my opinions off of facts, rather than assumptions.