SARS was different . It was very lethal but burned itself out. The people mainly affected were hospital staff . With lockdown and patience we were able to sit it out and it was largely over in 9 months .
Covid 19 evolved into the delta strain and that rapidly became much more virulent . Also breakthrough infection was seen amongst the vaccinated because the original vaccine in whatever form targeted the alpha strain. Fortunately the mortality has been low for the vaccinated
Its very easy to say double down on control measures whenever case spikes . And then what ? When you inevitably open up again the cases will again surge . It will never end . Meanwhile economy dies .
The sensible thing is to vaccinate and then open up. Cases will surge and then plateau at an equilibrium and then eventually come down .
Perpetual lockdown is no longer an option 18 months into this pandemic . 98% of vaccinated people have mild or no symptoms . Mortality is at 1.8% with the unvaccinated and those with serious comorbidities 11 times more likely to die . You cannot ignore these statistics.
Cases will surge . There will be more deaths . Rite of passage to emerge from a pandemic .