Well as shown in Korea and other places that really isn't true. You flatten the curve as the government call it, by taking aggressive measures to contain it. You do nothing and the curve shoots up. This is born out by the experience and examples of other countries across the globe.
What happened in Hubei as you rightly point out, was the result of doing absolutely nothing.
The healthcare systems were overwhelmed, as they are now in Italy, with doctors choosing who to save, and who to live or die. Try to imagine that.
I am not playing partisan politics here, this is not political point scoring, or cheering for one team over the other, I want my family, including older relatives to have the best possible protection from a government, who are compassionate/competent
You'll have plenty of time to rage against the Chinese when it is all over. Right now you should concentrate on you and your own family, and get active (prepare) because the governments' policy could utterly break the healthcare system, and a majority of the population of England could end up with this thing. And yes if it comes to that, then many old folks won't have a fricking chance...so ya I'm fuming...
To be honest I think in week or two things will have a momentum of their own, irrespective of the government advice, and people will start acting on their own.