This is the exact same insecticide used by certified organic growers. Plant breeders have just engineered the plants to produce it in their leaves, not in the corn itself.
For thirty years objections have been raised, scientific research has been done disproving the objections. Yet Bt corn is still banned in a large part of Europe.
So they aren't really seperate.
"It's better for the environment" is a poor excuse when you have angry farmers yelling outside one door, and poor hungry people outside the other.
Europe might be a big enough market to be worth the R&D though - although it doesn't grow anywhere as much corn as we do.
When a pesticide is widespread, insects develop resistance. At the moment, few insects have resistance to BT, because it is not continually in the environment in sufficiently high numbers.
So it works as an organic insecticide when needed.
Genetically engineer it into large numbers of plants, and in 30-40 years it is no longer effective.
Which means organic farmer no longer have the option of using it.
Putting BT-Genes in plants also means using pesticides indiscriminately and precludes targeted pesticide use.