Earlier quoted context omitted.
> Ban [something] because it's not effective. In the case of antibacterial soap, it's somewhat harmful: those antibacterial chemicals get in the water supply, and exert extra evolutionary pressure on bacteria, leading to increased chance of resistant bacteria.
Some people enjoy using the product for whatever reason and spend their money on these products. Should we just ignore those preferences? Why are we so quick to disregard those preferences in some cases and not in others, such as recreational drug use?
They also pay extra to buy shampoo with vitamins in it despite most of them knowing it does nothing. They just want an excuse to buy the more complex version of a banal product to exert some control over their banal lives.
In this case, the FDA can exert some back-pressure because of the significant risk to developing resistant bacteria against the soap constituents, which are needed in medical settings, so they are.
Unfortunately there isn't anything to do be done about rinsing vitamins down the shower drain. Not yet anyway.