[Retric]

Markets are not limited to buyers, which means their would be sellers benefiting from and promoting damaging behavior.

Now, if the government is manufacturing and selling without advertising that might be closer to the platonic ideal you're describing.

[blubb-fish]

Regulated manufacturing - like with food and then controlled selling like with alcohol, cigarettes or medical drugs.

I mean nothing is bad by itself - we don't prohibit knives b/c people stab each other.