Take for example...
1. Tobacco
2. Pharmaceuticals
Both industries have been sued for harm done by their government regulated products. If you think government should regulate marijuana and corporations should distribute it, I think you are an idiot.
Selling THC in a processed form, as a pharmaceutical drug, is one thing but the sale and distribution of pot is another.
This sort of thing is best left unregulated. If people want to be stupid enough to somke a poisonous weed, let them have at it. But don't put a label on it, regulate it, and sell it in a store.
Both industries have been sued for harm done by their government regulated products.
And yet they're both still in business ... and others, such as brewers and distillers, have never been sued (AFAIK). Pretty weak argument for nonregulation.
(So do you agree that enriching criminals is bad policy?)