"That would seem to argue that severely deleterious effects will only persist as long as people keep creating more of that modification and thus preventing unwa

"That would seem to argue that severely deleterious effects will only persist as long as people keep creating more of that modification and thus preventing unwanted spread of such things." Eh, sorta. I didn't say it precludes living a long time or reproduction, more that its not a necessity. I don't have huge concerns with GMOs but do worry more on the ecological side - specifically biodiversity and whether superspecies will have larger unintended impacts than we predict today. The flip side to this is that using less resources to produce our food is a tremendously under-discussed ecological benefit of GMOs.