There's a handful of times where my opinion on something has been flipped by a single argument that fits into a single paragraph or even sentence, and my opinion on GMOs is one of them. Nassim Taleb argues that while any given GMO product may be in fact entirely safe, that as you consider the whole line of GMOs that will be created over the next decades at an accelerating pace, the odds that at least one of them turn out to be catastrophically bad enough to entirely erase the benefits of everything else done with them goes up quite distressingly.

This makes sense of the idea that A: all current GMO foods are actually quite safe but B: it may still be a bad idea in the long run. Given that things will be GMO'd on an increasing curve as it becomes easier and easier, we've seen only a very small fraction of what will ultimately be done with the technology.