It has become clear that a hard lockdown does not protect old and frail people living in care homes—a population the lockdown was designed to protect. Neither does it decrease mortality from COVID-19, which is evident when comparing the UK's experience with that of other European countries.
Measures to flatten the curve might have an effect, but a lockdown only pushes the severe cases into the future • it will not prevent them.
It's like banning automobiles...
...to deal with drunk drivers...