Claire I do understand what you are saying. There is a lot of information out there. Sometimes it comes out that something is wrong with the latest food because of science/research/evidence, not just because of a financial motive. Like with the soy thing, I don't think a new gimmick is being pushed so much as people who research for a living are saying "look what I found out" and "we're putting it out there so you can't say we didn't tell you".
After all, there was a day when cigarettes had no warnings, people used to paint their kid's bedrooms with led paint, etc. Someone who researched for a living found out there were risks and that's how we know. People are free to smoke in led rooms if they want, but some people may decide the risk isn't for them. I guess you go with science if it makes sense to you, or you go with what your family raised you to do because in 1925 grandma did it, and so on.
I agree with the common sense factor, which is why I am against drinking cow's milk whether it is skim or full fat. My family drinks it and more power to them, but common sense (to me) says I'm not a baby cow so why would I drink like one? But sometimes there is little in common about our senses, you know? To each their own