The most common use of the concept GMO exclude simple breeding, which is what we have done for thousands of years. We didn’t use to transfer genes between species or even between kingdoms.

I’m not that worried, but I’m not that fast to exclude the possible that something goes dangerously wrong somewhere, say some crop with new genes that make it spread uncontrollable through a whole ecosystem, in the same way invasive species sometimes do.

And then of course the issues you bring up in your last paragraph. The technique is in general not used to help humankind or the world, but to maximise revenue for the corporations. At least in the industrialised world, it is now more important to increase biodiversity than to maximise yield.