Put yourself in the PM’s position. A Chinese virus, as usual, is heading our way. A number of countries are starting to see increasing cases. China hides the real issue and the scale of the problem which had been going on for months, but again they had said nothing. Now you have a decision, on the one hand some are saying we are all going to die and lock everything down (Davek was arguing it was no worse than the flu upto the end of Feb and that it was being overblown), while others were saying if you lock down you will kill the economy and more people will die. What do you do ? Even with everything you know now, really what would you have done. Lockdown and ruin the economy or wait and see ?.....
Countries far closer to China managed to lock down and employed a zero-covid policy rather than aiming to 'take it on the chin' whilst letting it 'pass through the population'. During this time, Johnson was telling people to ignore it believing it'd simply go away, insisted on shaking hands with everyone during a hospital visit, and missed five COBRA meetings whilst other countries were preparing. Vietnam has a considerably higher population with a greater overall population density, and are sitting on 35 Covid deaths.
The report that came out in 2016 warned that we were nowhere near ready in case such an event should happen, and the government completely ignored it. Regardless of the efficiency of the vaccine rollout, the fact we're sat on 126,000 deaths and counting means that the high ground cannot be taken and no victory can be claimed - especially when medical professionals were crystal clear about the negative externalities arising from a late lockdown.
With regards to the 'Chinese virus', I suggest you do some research into the shocking rise in hate crimes against those of South-East Asian heritage in the UK as a consequence of this immature and dangerous rhetoric.