The countries that succeeded *shut* things down.
I remember when Wuhan shut it down and prevented a broad spread to the eastern Chinese megalopolises, people were already saying here - this is like in March/April - that we just "couldn't" shut down as they had, and I asked people why, and I never got a satisfactory answer.
If you plan correctly and have functioning social services you can go 10 days without leaving the house. It sucks, but it's better than still dealing with a pandemic 6 months later.