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Because its nutritional information. There is a difference between a loaf of bread with 5 grams of fiber and 1 gram of sugar per slice and a loaf of bread with 5 grams of sugar and 1 gram of fiber per slice.

What difference does GMO make in the product you buy?

You don’t mandate it any more than you mandate people to label their products to be organic.

Its anti-science fear-mongering.

If GMO was as hazardous for you as rat poison and plutonium, I would support GMO labeling, heck, I’d support banning it.

You see your assumption here is that there is something bad about GMO and we should let people know.

I can make arguments for why SOME types of GMO are bad for the environment and crop diversity but this drive to label GMO is anti-science fear-mongering in the same category as the anti-vaccine movement and some parts of the organic food movement.