Obviously, everyone cares.
But you shouldn't say that they are totally wrong, you could say that they could be more specific, but not wrong. In your example, if someone said that the salmonella outbreak was in vegetables, and then someone went up and said that they were totally, completely wrong, it would be incorrect. (Sorry if that was a little rambling.)
Still, you could call them the British, it's just less specific.
You do realize that saying Paul Revere warned the British isn't wrong. America was a British colony at the time, so they were just as British as the people they were fighting.
Thanks for caring though, it restored some faith in humanity.
Crap. Sorry, I just noticed that. First thing I thought was, "Now everyones going to comment about that." And lo and behold, here you are.