many are modified for drought resistance and stuff like that. Increased pesticide resistance is only one branch. Also the main problem is them trying to use capitalism to control our seed supply to make money off it.
Also the GMOs don't cause the problem, it's the pesticides we use.
We have a food problem, that climate change is going to increase significantly, we need to use GMOs to produce enough food.
Also, if we know what a specific gene does, putting it in another type of plant really doesn't change much. Its just a quicker cross pollination, which we have been doing forever.