The experts get things wrong too, and when they do the politicians who follow their advice take the blame.
Fair enough in most cases, because even though the experts got this thing wrong, they are still the best bet for good advice in the future. Sacking a virologist or doctor for advocating this course of action will just deprive the Government of advice from someone who knows more than they do.
The partisan hyper-critical silliness of the media and the usual suspects just make it harder for government to follow what they judge to be the best path; everything is second guessed, there's a plethora of talking heads claiming to be experts (and I'm sure some actually are experts in the specific field, but not all of them) who will denigrate whatever decision is made.
The only choice appears to be in the words of Churchill "Keep Buggering On", stick to the plan, sell it as best as they can, consider all the advice and make the decisions in good faith. It won't stop all the ********* criticising everything, but it's better than having to bend the best course of action due to political pressures. Mostly that is what Johnson's Government appears to be doing, thankfully.