Within the established scientific community (of which I am a part as a geneticist and a microbiologist), there isn't as much debate on the validity of GMOs as you might think. There's a lot of debate on the business practices of companies like Monsanto that seem to overstretch their bounds when it comes to enforcing their patents (and much debate about the morality of being able to patent genes and living organisms), but not much debate about the safety of GMOs. Those studies where they "showed" that GMO DNA or RNA got into host cells were never able reproduced and/or shown to be faked (depending on the study).

Companies that make GMOs are opposed to the labeling of them as such because of all the misinformation of them out there (they've been tested for years and shown to be safe and not cause cancer unlike what you've heard) and they're in practically everything (which would make labeling overly tedious, but mainly they don't want to label them because of all the fears out there based on misinformation.

Sorry if I offended you with the mislabeling, but I tend to get hit so often with the people that think GMOs are going to kills us all if the big pharma companies don't don't kill us all with their secret mercury poisoning of us through vaccines, but I probably won't live long enough to see it because one of these days I'm going to be struck by lightning because I can cause bacteria to evolve and demonstrate that to you or impressionable college students in less than a weak - making me an agent of the devil.

Does the fact that GMOs have been shown to be safe mean I don't think there should be some regulatory agency that they have to pass things by (maybe a commissioner of common sense)? No, you never know what someone (well meaning or not) might decide to do one day out of stupidity (I don't think we really need pets that glow in the dark), but I also think the FDA (or someone similar) should be put back in charge of regulating vitamins and dietary supplements.