Even if that is the case (and there's precious little evidence for your assertion) it has a significant probability of being fatal for a significant proportion of our population. To protect our fellow citizens, we should be working together to keep the prevalence of infection, which is synonymous with infective, a low as we reasonably can. I see that as the objective of the rules and I find all the attempts to circumvent or gratuitously breach the rules as a mark of complete lack of compassion for fellow citizens.
I didn't because it is irrelevant. There is some evidence that a significant number of relatively young patients suffer debilitating symptoms for a prolonged period, though my guess is that much of this is mixed up with psychological and common post-viral symptoms. The point for you youngsters is that if I do the decent thing and succumb to the virus it may well take me weeks or months to do it, and even if I recover, which I have an 85% chance of doing, I will still consume resources that you would not unreasonably prefer to reserve for yourself and your family. We have examples from other countries that have been almost brought to a standstill by the disease, and I understand that the health service in the Czech republic is on the verge of breakdown this week.
A lockdown in the Chinese style, by carting infected or disobedient people off into isolation does appear to have eliminated the virus, at least until it reappears. Nobody has suggested that our limited actions are going to do the same, only that they are necessary to prevent even worse disruption to our essential services. It is not only the NHS, but transport and food distribution that would collapse in a megademic. There are those who would favour even tighter or earlier restrictions, so those like me who have come to accept the current situation are somewhere in the middle of opinions.
If lockdowns do nothing to get rid of the virus than how come New Zealand, by use of lockdown measures managed to stop the spread of infection there? and they have been virtually free of Covid since?
Regrettably, if the population have no immunity from social contact then they will be wide open to a resurgence of the virus should it start up again in their country. They hope for a vaccine before that happens but there is no guarantee of that any time soon. They have to be eternally vigilant now or that will happen, again with no guarantee they can stop it's spread. You cannot kill the virus by hiding from it, it won’t go away, it is still there. You can try and buy time and shield the vunerable that is all.
they stopped importing people, unlike us who chartered aircraft to bring in folk from hotspots worldwide & kept out airport hubs working
A vast majority of 66 million people could be anything from 40 million plus. That still leaves up to 26 million then where it could be a serious threat.
