such as reduction in crop diversity,
Note even remotely how things work. Diversity is genetic sum of what you grow. Genetic engineering is a way of improving crops. They're not at all the same thing. What you are saying is like saying that spinning rims on cars are bad because it reduces the number of car models. It doesn't make any sense at all.
or unintended consequences
Oh like what? If you have evidence that there is some intrinsic deleterious effect of GE crops, show it. Otherwise, what you are doing is vacuous speculation. I could just as easily speculate on the 'unintended consequences' of vaccines, wifi, water fluoridation, or anything else I fell like opposing today, and it would be just as meaningless.
So "the point" is clear: to use labels to introduce non-health related message to consumners.
I call that deceiving people to advance an unscientific agenda.