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Not so simple. Where are farmers supposed to get normal seed these days? How are they supposed to avoid contamination of their fields from GM-crops? How are they supposed to stop Monsanto detectives from trespassing or Monsanto from using helicopters to fly over spying on them?
Monsanto contaminates the fields, trespasses onto the land taking samples and if they find any GMO plants growing there (or say they have), they then sue, saying they own the crop. It's a way to make money since farmers can't fight back and court and they settle because they have no choice.
They've written Monsanto seed laws and gotten legislators to put them through, that make cleaning, collecting and storing of seeds so onerous in terms of fees and paperwork and testing and tracking every variety and being subject to fines