Note the problem on biosafety is more that good GMOs will be banned because they'd spread pesticide resistance to weeds without terminator tech, not that they will be introduced illegitimately and spread pesticide resistant genes to weeds.
How exactly would pesticide resistant genes transfer to weeds? Unless the your GMO plant interbreeds with weeds, witch is not very likely based on the fact that you do not often stumble upon tomato-dandelions (if I'm terribly misinformed here please tell me). And horizontal gene transfer, have not been observed to any large extent in multicellular organisms.
I'm pretty sure that this worry is more about passing herbicide resistance to weeds, for example, canola and mustard are closely related, wild mustard can be viewed as a weed. This was the first result in a google search for "canola mustard hybrid". If, for example, they handle highway medians by spraying herbicide, and all of the sudden, the wild mustard can thrive in round-up, then they would have to use a more costly method for median maintenance.
My biggest objection to GMO's and the reason I strongly avoid them, is that I don't feel there...
I was raised to believe that genetically-modified foods are unhealthy to eat and bad for the environment, and given a variety of reasons for this, some of which I now recognize as blatantly false (e.g., human genetic code is isomorphic to fundamental physical law), and a few of which still seem sort of plausible.
Because of this history, I need to anchor my credence heavily downward from my sense of plausibility.
The major reasons I see to believe that GMOs are safe are:
The major reason I see to believe that GMOs are dangerous is:
So: green goo, yes or no?