The Hunt for Elusive 'Dumb' Rules
nytimes.com
nytimes.com
The cost to the government of a new regulation is zero. Either they will appropriate the money from the endless money fountain to pay for the necessary expansion, or they will simply fail to enforce it at their discretion. The benefit to the government of a regulation is always positive; if nothing else they get the choice of enforcement, and the corresponding power.
It is no surprise this system never produces results, beyond cosmetic fixes. I don't know what the solution is but somehow the incentives to the government have to be fixed first.
(Okay, Wikipedia tells me it's no longer considered carcinogenic, but certainly it was considered so during a period in which it continued to be used as a sweetener.)