To be fair, I'm a civilian looking seriously at some III+ hardplates.
Yeah, but they said "wear". I've got a plate carrier too, but it stays in the closet for when red dawn happens.
I think it's the duty of every American citizen to have a carbine, 1k of ammo, and LBE- but typically our stuff collects dust in the event of Russians invading, zombie apocalypse, FEMA camps, and other assorted, yet unlikely nightmare scenarios (protection from enemies foreign and domestic and all that jazz).
That being said, we don't typically wear our stuff. The only civilian that I know who runs a plate carrier with plates with any regularity is nutnfancy, and I don't believe he's considered the norm.