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To be fair, this is a cabinet selected for its willingness to dismiss and denigrate any and all expertise that doesn't suit the party narrative of the day. Johnson boasting about handshakes and proclaiming the UK would remain open for business when Italy was being engulfed is redolent of his contempt for the science, and MPs have been lobbying for controlling arrivals to the UK and implementation of quarantine measures for months now.
But there have been lots of potential pandemics. If the response to the first slightest sign of a potential pandemic was instant lockdown that would be a bad policy. They didn't choose optics over action, they made a difficult call that everyone is now criticising in hindsight.