I work for a plant tissue culture company and love how my boss framed this issue. To paraphrase him "Farmers in the U.S. used to grow a bounty of crops with great pesticides. Consumers would just need to wash it off. Now we're hurting our farmers by banning the use of these pesticides because of environmental or health reasons yet we import these same crops from nations that use the same banned pesticides we used to. The only way american farmers can compete now is to put these chemicals INSIDE crops via genetic engineering. Obviously we are no longer able to wash those off..."
there is some truth to this... but the damage to the environment is not a trivial thing. these pesticides can kill off plenty of "good" insects, and easily polute ground and surface water... those things don't just "wash off"
I saw mention of BT in this thread. we have grown BT corn. It does allow for less pesticides. but it is far from ideal for fresh market produce. the protein that protects the corn from the worm is only produced while the plant/cob is growing. once the silk dries the protein is no longer produced and the insect is free to eat away and damage the crop. thus, you need to still spray to prevent the insect damage. You don't spray, you get worms. you get worms, no body will buy