Unlike covid-19, this is a killer we have created and that we can do something about. Boris called the first lockdown because the science pointed that way at that time, and the First Secretary, Dominic Raab, presumably renewed it because Boris was ill. But whoever renews the lockdown again would simply have blood on their hands.
The political reality is that the government has boxed itself in by allowing policy to be dictated by opinion-poll; it bowed to pressure to copy everyone else (apart from the free Swedes), then had to scare the public into compliance with the lockdown they’d demanded, and now the public is indeed scared. But look purely at the likely toll: even if declaring lockdown was originally the right move, leaving it in place can certainly be the wrong move. Protect the vulnerable, sure, but lift the lockdown: back to Plan A.