The poster with the slogan was issued in 1939 by the British. We don’t have anybody bombing our cities or threatening to invade us- exactly- but the coronavirus is a national challenge with social, financial and health related impacts unlike anything most of us have experienced. I’m not sure I’m overstating it to say that you had to be alive during World War II- maybe the attack on Pearl Harbor- to have had a similar experience. The speed with which it has hit us is remarkable.
I lived in Dublin for two years and I can tell you that when the Irish close the pubs, it’s serious.