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I had no particular content in mind, but shag is certainly correct here.
WS seems to assume that if one passes a law (e.g., ban on guns in public spaces) that the result is automatic, without any attempt at enforcement. Enforcement of _any_ gun ban means that those who violate the ban have to be discovered and their weapons confiscated. My post raised the question of how guns now in circulation were to be removed from circulation.
I can imagine a ban being useful even if not enforced, but that is another question.
Carrol