God, OP, I had to read your posts several times to make sure I was reading them correctly.
YANBU about the hysteria (that I only read about on MN, to be fair) about children returning to schools. Now, I'm in Ireland, and here, no-one is going back to school until September (primary school kids finish at the end of June anyway, secondary at the end of May) so there's less of an issue here.
YABVVU to talk about the response to Covid being disproportionate - particularly in light of the number of deaths in the UK, which are staggering per population, and can only be imagined if the lockdown measures were not imposed, although done belatedly.
No, lockdown can't 'stop' the virus. It manages a situation to allow capacity to be developed, testing to be enhanced, and solutions to be developed.
The thing that you are not realising is that it's utterly glib to say that it is unlikely to affect otherwise healthy individuals. To an extent, this is true - people with other co-morbidities, or from a particular demographic, are disproportionately affected.
But in other ways, you are SO wrong - someone can be very healthy in every other way, but be prone to chest infections, have asthma, have diabetes - in normal terms, these individuals are healthy, and yet Covid represents a huge risk to them.
A pregnant woman becomes at risk, even if otherwise healthy, because breathing capacity is reduced due to pregnancy, and I'm aware of several cases here (personal knowledge) where babies were delivered by section under general anaesthetic due to the mother's health severely deteriorating. In one of those cases, the mother was kept under and then intubated at that point, and remains very ill since.
Also, the whole issue with Covid is that very little is known about it. Again, I am aware of some individuals who were perfectly healthy and ended up in ICU with Covid. One man I heard interviewed was in his early 40s, extremely fit, ran marathons etc, and spent 21 days in ICU. Thankfully recovered but it was close. At the same time, there is wholescale testing in nursing homes here at the moment and one perplexing factor is that some very elderly, otherwise unwell patients are testing positive for Covid, and yet are absolutely fine (in that respect) and utterly asymptomatic, while the next patient presents totally differently.
This makes it nearly impossible to advise and manage the illness without very strict controls. Hence, lockdown.
There's no doubt that many of us have had Covid, and are unaware of it. Some of us may have had it (it's now thought) in late November / December, when GPs (in Ireland at least) reported very strange viral illnesses doing the rounds, flu-like that wiped people out for weeks, and there's a strong belief Covid may have been in Europe much sooner than when the first reports came from China in the New Year.
At one stage it was thought if we had it, we could be tested for antibodies, and then essentially would be 'safe' to be out, not infecting anyone else, or at risk of infection. The WHO has now rowed back on this and said it's not clear that contracting Covid once would make you immune to further infection.
So the point of lockdown was to control a desperate situation that modelling had shown was likely to run rampant throughout countries (and did - ref: Italy, Spain, pre-lockdown), and if you look at the way the deaths rose in both UK and Ireland, with restrictions in place, it's clear the situation would have been utterly horrendous without them. (ref: R rate)
Now that the situation has been controlled, the point is to manage our way of interacting to minimise recurrence and spread - it's not gone, and we can expect further surges (as has happened in countries that came out of lockdown sooner than we did e.g. South Korea). This isn't just about Covid - it's a completely different way of interacting and managing hygiene so that other viral pandemics can be controlled, too. All epidemiologists that I've seen commenting say that this was always expected, just when. Some expected it with SARS or swine flu, but largely those were confined to Asian countries and we were able to manage them in European countries when we had to deal with them. Covid is obeying any 'rules' as we know them - and that's why now, we are planning for an entirely different way of living.
It's quite shocking to read your posts, and I just wonder - have you read or studied any reliable sources in the last 2 months? Do you not have to address these issues as part of your daily life or work?