This implication has two problems:

1. This handling of new technology's has always been like that. The first nuclear reactor was build bevor they knew if it even works. No body thought twice about the danger. The difference here is that it benefits poor people more than rich so most people don't care really.
2. In the case of most non-competitive mutations we know exactly what happens. Because this argument is so old, we now have detailed study's on gene mobility like vitamin A enzymes. Because the plant can't use that much of it, the gene is silenced very quickly. That means that your crops will yield yellow and white seeds. The farmers have to plant only yellow ones ore the genes can hardly be found on his field after a few generations.