How many policemen would volunteer to raid gun owners homes who refused to surrender their firearms after a few hundred bloody shoot outs? We found out during prohibition that cops don't want to fight wars, they only want to address individual lawbreakers. If the cause was not popular, they would ignore it and fake the majority of their responses if not completely turncoat. If you really wanted to ban all guns in the U.S. you would have to use the military and the military tends to vote pro gun, and the military is not to be used against it's own citizens, so in effect you would have to trash the constitution to enforce a total gun ban, and yes this would cause a civil war.
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