The reason was very clearly demonstrated earlier in this thread, with all the fear, uncertainty and doubt that some folks attempted to promulgate, most notably, as Geoff so clearly pointed out, with the "frankenfood" remark. There are partisans arrayed (for whatever reason -- often partisans don't even realize that they're being deceived and exploited) against GMO, and so they effectively have unfairly demonized the label. Unfairly demonizing labels is a very common propaganda tactic. It doesn't enlighten, but rather deceives, and therefore is a destructive and indefensible tactic.I agree with this 100%. The whole labeling thing is what bothers me. I just don't understand, if the food industry is convinced that GMO's aren't problematic, than why resist the label?
There are also a load of old adages about the damage that stems from trafficking in fear of the unknown. Neither extreme is justifiable.It all comes back to the old adage about, "just because you can, doesn't mean you should."
Here's a good one: "Sometimes you have to go out on a limb; that's where the fruit is."
Well, I only buy organic what NEEDS to be, like thin skinned fruits and veggies, coffee, chocolate, etc. Things like bananas, oranges, and avocados can be conventional because of the thick skin. 
