True NEED never enters into anything at any point. The vast majority of our possessions are not purchased out of a real and justifiable need (and those we do need are usually in excess of the actual need, like clothing- we can get by with much cheaper duds than we usually purchase). You can even make the argument that we have no true NEED for even one gun- yeah, they're useful and you're worse off without one, but when it comes down to it our needs are food, shelter, clothing, and medical care (and not much of any of those four).
Seeing as how harmful acts are already illegal, I see no reason for body armor to be restricted.
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