An "essential tool" as you said in the first comment implies that "must" be part of the full solution, a must have.
My problem with GM does not consist in fear of glowing green in the dark but is bunch of more long term problems:
1. Patents/monopoly of food. ./ is full of it
2. Effects on surrounding culture/nature
3. Posibility of a mistake
Selective breeding is having a risk also but is a risk mitigated by the time. The chance of something going wrong suddenly is much lower, and cand even give your body time to adapt in time.
Now let's say that somebody having almost a monoply in seeds, is playing with GM and screw up big time. How many people will be affected, what are your chances that your body adapts in few years.
All of this only for having a small tool, when the real problems of feeding the planet lays in corupt governments, inneficiency, wars, poverty and "don't give a shit as long as is no gain" attitude of the western world?