I think they are frightened of the political consequences of being blamed for people dying. They're between a rock and a hard place there, because lockdown measures also kill but they're hedging their bets that public condemnation would be harsher on COVID deaths than other, more indirect deaths (and they are probably right about that, for now at least). The first wave of measures were introduced in a bit of a panic and it is hard for anyone, especially politicians, to admit to making a mistake.
I'm not 'anti-lockdown' as in opposed to all restrictions, but personally I feel things have gone too far and much more of what has should be voluntary public health advice rather than severe mandatory restrictions. I would also like to see more weight being given to the known harms of restrictions and a little less to the theoretical harms of not introducing restrictions.
I'm worried that the response is locked into a vicious cycle where if the infection rate goes down, it's because restrictions were necessary and are working, but if the infection rate goes up, it's because people aren't following the rules properly / we need harsher restrictions / things would have been even worse without the restrictions. I'm not sure that the efficacy of restrictions can be objectively considered in this kind of 'heads I win, tails you lose' mindset.
I'm also worried about how we get to a point where some people dying from COVID-19 is considered acceptable (from a national policy point of view - of course it is always sad when someone dies but everyone does die) and whether politicians will ever be able to say that without being crucified. The vaccine is dangled in front of us like a carrot, but if we get a vaccine but it doesn't prevent all COVID-19 deaths (which obviously it won't), will that be used to further extend the national state of emergency? I can't see any long-term plan or clear exit criteria.