All to make the powerful(AKA monopolistic oligarchy of corporations) even more satiated with control.
Governments have antitrust laws to handle monopolies. If you're concerned with concentration (as I am), you should support more aggressive antitrust enforcement (and political candidates that do).
What externatlity is that? If they want to fight sex trafficking, really fight sex trafficking, they need to start by making prostitution and other forms of sex work legal.
Prohibition is what drives the activity under ground and creates the market for Sex Trafficking in the first place. It forces people that want to consume those services to a market that is outside the law, as such bad things happen, this is same for Drug Prohibition.
All you have to look to his the passage of the 18th amendment, all of the problems and violence prohibition of alcohol brought, and then the passage of the 21 amendment to end it. Today I do not see Budweiser shooting up Coors over territory, do you?