Ahh HBT, you never cease to put a smile on my face. I didn't ask what causes cancer in the world, that's what CNN's for. Heck, I didn't even ask what causes cancer in beer. The only thing I'm interested in here is what questionable ingredients you guys find yourselves using when you homebrew.
As for the Raw food thing, I was just being sarcastic. There's no way I would substitute my diet for an all raw one. I'm a firm believer that our ability to cook food, is a key attribute in why we're human. Cooked food led to a higher evolved degree of brain development over millenia, as it introduced different protein chains and vitamins unobtainable before.
Local, Organic produce and meat is the way to go. I wouldn't buy organic eggs from California living in New York, it defeats the big picture in my eyes. Now, there's nothing wrong with pesticide, hormone, antibiotic free foods. If one so chooses to go that route, so be it. They'll always be plenty of people to call it a joke, and keep on eating their big macs. The system wont fail because of the hippies. Relax, have a home brew. Oh, and there's plenty of information available to show organic is "healthier". For example, US Lamb is injected with a growth hormone that is directly linked to breast cancer. NZ and Aussie lamb is hormone free, organic. Would you honestly rather have an antibiotic, hormone injected piece of meat as opposed to the latter? There's a reason that Europe has a total trade embargo with the US on meat products. They completly ban the use of the nasty stuff, and totally refuse to take ours. I'm with the Germans

It seems pretty obvious to me that something organic, is healthier. Simply because our bodies evolved without all that garbage, and now that it's being introduced to our diets, we don't know how the hell to metabolize it. It sits in us as a foreign invader, and eventually renders itself harmful. Children (more prominent in girls), are hitting puberty at ridiculously early rates as compared to 75 years ago. It's an obvious, and direct link to growth hormones from meat in their diet. Yet, everyone wants to deny it because they grew up eating it and are fine. Are we? I'll let you be the judge. At least that's how I see it, if you do differently, I've got no problem at all. Another beauty of being human is how we get to choose what we want with our lives. The fossil fuel thing related to organic farms being further in the country is a funny one. Check out where that orange juice in your frige came from, probably china. Makes me wonder how much shipping goes into having every vegetable under the sun available to me at wall mart in the heart of a mid-west winter. If everyone bought local organic, we would save BILLIONS on fossil fuels. Heck, it's one of pro arguments for it. Seems like there are stronger arguments to address then fossil fuels when opposing. Like you said, unreliable yields, high labor input, etc.
In my opinion the FDA is exceptionally questionable. One example of many; They consider high fructose corn syrup "natural". HFCS is a molecularly compromised sugar that is found no wear in nature. It's synthetically made from a corn base, and can't be metabolized as easily as sucrose. Our bodies just don't know what the hell to do with it. But alas, it's natural. From a homebrew standpoint pertaining to the FDA, I highly doubt they regulate any of our ingredients JefetheVol. There's a ton of things they have don't have anything to do with, and unless you prove me wrong (I'm not 100% sure just assuming), I'm going to go on believing that our hobby is void of FDA regulation.
This is all strictly just my opinion, of course they'll be plenty of people who disagree. I eat non organic meat all the time, and drink in excess even more. Once again, I was only interested in what you saw as sketchy with homebrew ingredients. I know the sun is bad, and botulism sucks. Ha, maybe if we didn't have antibodies in our meat, we could build up a better resistance to it? Ohh man..
Prost!