"The operation was a success, but the patient died."
That’s precisely why a state like Maryland or PA shouldn’t shut things down (except maybe the publik skrewels, where kids can spread it like wildfire), until 3/4 of counties have problems. Same with the US: No national shutdowns until 3/4 of states already have shutdowns. Because in each case, 3/4 would be a clear signal that the virus is moving freely about the state or country.