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Food vans? Lemonade stalls?
This is the problem with laws. They affect those outliers you may not have considered.

Making lemonade with store bought products would be as simple as showing them the products used.

Monsanto is using this lax labeling requirements to own our food supply. I think that is a far greater risk than listing if your beef was raised inside or outside, organic or maybe GMO for all we know soon.

Without Monsanto, I wouldn't have any reason to even suggest GMO labeling requirements.

This is where I think the rubber hits the road. To my mind, deregulation opens the floodgates to competition, which thrives on innovation, and supplying customer demand.
Many people believe as you do, that GMO foods should be labelled as such, but the big supermarkets don't have enough competition to have to worry about doing so.
Not to mention the subsidies I'm sure Monsanto is getting from the state.
The moral argument says that you shouldn't interject your labelling preferences on people who aren't yourself.
The practical argument says that Monsanto and the big supermarkets are only able to keep competitors at bay by hiring policemen to stop them, through the machinations of government.
More government is never the right answer.