I had no idea but it seems like GM crops have been cultivated in the US for almost 20 years now. Just to let you know, most south-america countris are GMO free.
Theorically, they are a potential threat to the enviroment, specially plants with resistance to herbicides. But if so many years have passed without GM crops causing a huge impact on the ecosystem, then I guess they're not as bad as one would think.
However, I have no idea how bad they can be for us after 30-40 years of eating then, and even if it is safe to eat a GM corn or soybean, that doesn't mean any other GM is healthy, genetic engineering doesn't work that way.
To be honest, I'm surprised to read there are not health risks associated to eating plants whose pollen have insecticide properties.