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I think it's fair to assume he genuinely doesn't want a lockdown
I don't believe this, or at least I don't think it's his primary driver. I suspect it's just political awareness. Once he starts locking people up and issuing dictats about people (in their minds) minding their own business, he'll be incredibly, personally exposed at having interfered with people. Maybe not immediately, but after weeks / months of the measures that he'd have imposed.
Boris Johnson is a libertarian so I think it's fair to assume he genuinely doesn't want a lockdown, it would go against all his beliefs. I honestly think he doesn't want to do it.