[Southack]

"Actually there is no constitutional way of turning that 'gift of power' down If the people constitutionally decide to enforce idiocy. It must be enforced !."

Laws go unenforced every day. Prohibition, in contrast, was embraced by government.

[Reily]

Because it was demanded by the people!
It was a fit of democratic demagoguery run wild ! It initially was very popular! There was massive moral blovating about how necessary and right it was !

Government is not a conscious entity it is simply an agent.
As you say laws go unenforced all the time. Thats because it would be unpopular hence not worth the trouble to enforce. They don't get repealed for a whole variety of reasons from bureaucratic inertia or maybe some sense of misplaced moral guilt (Usually stirred up by a politician or in todays world the Kulture smog, media, the Hollyweird crowd, etc!)