When the We Can Solve it campaign tried to run an ad about the oil industry and the need for renewable energy, the ABC television network refused to run it. Yet when the Corn Refiners Association decides to run ads full of blatant distortions promoting high fructose corn syrup, nobody refuses to take their money.
There used to be rules for equal time for opposing views. There used to be public service announcements denouncing unhealthy lifestyles, instead of ads promoting them. In the UK or Canada there are advertising councils that are quite strict in what you can say, about even stretching the truth by calling a car green; in the States it seems to be a commercial free-for-all.