What happens when a GMO is released into the wild is irreversible genetic pollution of non-modified organisms.
The fact of the matter is there is NO science about how these GMOs interact in nature when left to their own devices, free to cross-pollinate other organisms. That kind of wilfull blindness is engaged in by companies whose goals are not science, but which are solely the pursuit of profit ( via omonopolistic wnership of genetic material).
As for your reductio ad absurdum argument about the non-dangers of "foreign" DNA: how does such an argument stack up against "foreign DNA" when it's wrapped up inside "invasive species"?
Not very well I would assert.
We've barely got our heads around the problems of plastic bags: from bags to the sea, where it's broken down, which is then eaten by microscopic organisms, which is eaten by larger ones which, quelle surprise! ends up inside us. Did we forsee that when we wrecklessly cast these plastic bags about the place? Did we hell.
Such wanton disregard and ignorance for the consequences of our actions seesm to be the human way. Wrapping up the persuit of profits with the guise of LIMITED science and subjecting the genetic material of the entire ecosystem to a vast experiment is not a sound, rational or wise thing to do.