Can we have some citation please? What GMOs produce insecticides?
The normal mode of operation is that the GMO is modified to resist pesticides, which are then added later. This has the added bonus for the company making the GMO, as normally they also make the pesticide, and that is where their profit lies.
While I agree that we don't really want to be eating pesticides, it is important to distinguish between where the harm is coming from. The act of GMing an O does not make it inherently bad. It is just a quicker way of doing what humans have been doing with their food crops since agriculture began, in a more directed fashion. Some GMOs are pesticide resistant (and I imagine this is the type you are worrying about in your post), while others do fairly benign things, like increase the vitamin content of a crop, or make it synthesise particularly tricky amino acids or fatty acids that are commonly lacking in people's diets... This is the problem with a greenpeace-style ban of GMOs, as they seem unable to distinguish between different types of GMOs, and only want an all out ban.