It's never been about the ~1% fatality rate.
Say these three words slowly. Overloaded. Health. System.
The peak of many waves in various countries has brought several first world health systems crashing to a halt.
When every ICU bed is full and ventilator occupied, and you have a car crash and need intubating... what then? Plenty of people are admitted to ICU each day without COVID. They would likely die under an overloaded health system.
We don't have lockdowns for glandular fever as is not really contagious, unless sucking face, so it will never overload the health system.
Maybe people should listen to those Paris doctors who just yesterday took out an ad in the paper to say that before long it is likely that they will have to triage who lives and dies, with or without COVID.