- cut down on the need for pesticides
- add more nutrients to the food
- resist infection and contamination
- grow in adverse environments
And they are getting the government to do their labeling for them. Unlike religious Muslims, Orthodox Jews, vegans and organic people who put the money into certification and have several organizations that check up on the food to make sure that it is kosher, halel, etc. and are easily supported by the market itself, anti-GMO pseudoscience assholes would prefer if the government did all the work for them.
Seriously, I tend to find most arguments against government bureaucracy to be self-serving and downright evil because they are advanced by libertarians who put everything into a "bad inefficient government vs. saintly private sector" dynamic as if the private sector actually has the resources to maintain the levies outside New Orleans, provide social security and fire departments better.
But there's a different between an essential service and a paranoid delusion service based on pseudoscience, especially when the private sector has demonstrated that it CAN provide that stupid service for minimum price.
It's like these assholes in Vermont have never heard of Whole Foods.