@CaraDuneRedux
Re cost benefit ratio.
Population of UK is about 68 million.
Deaths so far with covid on the death cert 81 K.
That's 1 in every 840 of the population with lockdown. Now probably about half of those would have died anyway this year, but pretty much every graph I've seen of "excess death rate" shows it at abou double normal for the year.
How much worse would it have been without? We don't know but presumably they'd have had to run a triage system. Call an ambulance with heart attack symptoms? Okay, we'll send one. With covid symptoms? Roll your beloved relative onto their front, tell them to do their best with deep breathing, pray and here are the contact details for local funeral directors.
That's what life without lockdown would have looked like. Probably better for the mental health of teens and children, probably only 1 in a 1000 under 45 would have carked it - but it was never going to be a choice politicians would make publicly.
I also think there's been a lot of "copy-cat" behaviour between countries and their leaders. I can just imagine all the squeals of anguish if Boris hadn't locked us down when virtually all other countries were doing it. When one country does it, others are under immense pressure to follow suit, and so it spreads throughout the World.
Unfortunately, the internet has facilitated lockdowns across the globe as it is possible to function (at least temporarily) with internet shopping, working from home, remote learning, etc., during restrictions and lockdowns. If people couldn't do that, I don't think we'd be having lockdowns at all, and probably far less severe restrictions. Quite simply, we'd just be getting on with it, and would have had to accept the collateral damage of lots more deaths, as we'd have no choice. On the bright side, we'd probably be over the worst of it now as it would have spread so quickly and extensively, we could well have herd immunity by now, though would have suffered huge numbers of people having been infected, many more deaths, many more long term illnesses, etc.,
It would be good if World leaders properly engaged with pandemic planners (scientists, etc) to have a proper plan for next time there's a pandemic on the horizon. It does seem the World, well the Western world anyway, was very ill-prepared for this one. The Eastern countries seem to have done far better as they've had more experience and probably took the risks more seriously from previous close escapes.