Re: #4: I'm not disagreeing with your policy ideals, but I would say that the law enforcement environments in the US and UK are different.

There seems to be a general "unenforceableness" in the US. It's near-impossible to carry out a near-universal ban of anything-at-all in the US.

Individuals, groups and even state/local governments in the US tend to simply take matters into their own hands if there's a law they dislike.