"the person beside you in the supermarket etc can carry a lethal weapon that can end your life."

not really sure what comment you read, but you clearly didn't read the one I replied to

Most states allow open carry https://www.usconcealedcarry.com/resources/terminology/carry...

That quote doesn't say anything about open or conceal carry. It simply says people own guns, nothing about how they carry them on their person.

There’s only two ways of carrying a weapon; open or concealed. Not really sure what you’re driving at here, nor the why.