The fact that he was shaking hands with coronavirus victims is beyond irresponsible
It was in line with the scientific advice at the time. And, as I pointed out upthread, this is not how he contracted it. The timescales are wrong.
I'm very irritated by people now trying to pretend that the government's initial position was not to let the virus take its own course
The initial position, as with many (but by no means all) other governments, was to protect the vulnerable and allow it to take its course amongst the less vulnerable so that we would develop herd immunity. I understand some governments (Sweden, being one of them, I believe) are still pursuing this strategy. Our government were hoping to avoid lockdown, apparently on scientific advice, as there is no clear way out. Unless we have eliminated the virus completely, which is unlikely, easing the restrictions is likely to lead to a resurgence. Ultimately it is almost certain that we will need herd immunity, either through people catching it and surviving or through vaccination. Unfortunately, it looks like a vaccination is over a year away.