In reply to your first paragragh, there were certainly lots of mistakes made early on but this was largely attributable to not having enough equipment and beds to cope with the first wave. The severity of the contagiousness and the effects of catching it were still being understood at that stage, it's easy to look back and wonder why we didn't just close our borders like other countries did but advice from the WHO and EU was not to (until mid March), but that would have been the best way to limit transmission in the early days. The discharge of elderly patients not being tested was down to the pressures on the NHS needing to find beds and removing what are known as 'bed-blockers' was their only way. Whether the government (or individuals in there) knew that they weren't being tested, but were told they were, is a matter for discussion. In the end, the hospitals are responsible for ensuring people aren't discharged with a contagious disease and I'm sure doctors would have ensured they weren't, knowing what they do now. I can only assume then that at that point they didn't know the full risks or were forced at gunpoint to do so (of which I'm sure we'd have heard). Again, this mistake was also repeated in other countries.
The issue about when to lock down and re-open afterwards, again, that's a tough one. There were/are pressures from sides to do opposing actions. Whatever Johnson says in a meeting is irrelevant - it's whatever policies are put in place. And in any case, trusting the word of a liar's liar (especially one tasked with strategy and planning) seems a touch risky. Remember this is a man who knows how to concoct a lie then believe it's true when it leaves his mouth. He knows that to be able to convince people of something you first have to convince yourself.
The former Downing Street aide also said it was ‘perfectly reasonable’ to argue that Brexit was a mistake.
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