“after someone called them to say there was a merchant selling Nazi and Confederate memorabilia at flea market, which some had found deeply offensive.”
I’ve no love for anything Nazi-related, obviously. There is a certain hypocrisy, however, in taking offense at that ,and then informing the authorities about a fellow citizen who is doing something (completely legal) you don’t like.
I knew a guy once who owned a German pistol which he took off the body of a slain enemy. Possessing the enemy's stuff is one of the benefits of being the victor and not the vanquished.
We're not going to do as well in the next world war as we did in the last one.