The reason there has been no debate effalump has been because faced with a pandemic caused by a new virus whose properties were unknown, most people felt the measures taken, broadly, were sensible and proportionate to the threat.
The fact that those who have objected have had the freedom to say so and have said so frequently shows that there has been plenty of debate on the issue.
I am sure if in 1938 someone had told Londoners that within 2 years the whole of docklands would be completely destroyed and vast swathes of housing all round them would also be completely and totally destroyed, they would have been very doubtful and would have questioned it. I am not sure anyone forsaw the horrors of trench warfare in 1912.
We cannot foresee the future and what it might bring and some of the things it brings are often unbelievable until they happen.