If GMO doesn't happen in nature how would one explain the evolution of life on Earth? Creationism? Alien planting? A whole lot of mini big bangs?
Evolution? Mutation and selection? Not gene splicing. If you think GMO does happen without people, that's when aliens get involved, I guess.
If anyone else wants to say "but humans have been doing GMO for millennia!" or the above, even stranger statement, please at least read the first couple of sentences of the wikipedia article, or make a similar effort to know what genetic modification means with respect to GMO foods.
No one has to agree with any conclusions, but it would be a plus if people actually know what it is.