Because anything, no matter how natural and healthy, has to be EVIL if any liberal anywhere actually partakes of it.
Now, anyone who pauses a moment to think it through would realize that food lacking traces of pesticides and chemical fertilizers -- indeed almost identical to the food found in the average vegetable garden in that regard -- has to be better for one than something dosed in chemicals. However, we are dealing with unthinking knee-jerkism here and not rationality.
I want mine raised with chemical fertalizer and pesticides and won't eat or buy any grown with no soil annalysis and pesticides to kill the bugs.