Why has half the world gone on total lockdown? Why not isolate the vulnerable and put in lighter social distancing measures instead?

Anonymous
If the aim is to flatten the curve of the pandemic and if the majority affected are the elderly and those with underlying conditions, why not isolate those people and then implement lighter social distancing such as cancelling large events, advising people to maintain a distance where its practical etc.
Why has half the world gone on total lockdown? Why not isolate the vulnerable and put in lighter social distancing measures instead?
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