That's ignoring intent they expressed to implement very long isolation measures for the elderly. Thier approach might be flawed, but let's debate it based on what has actually been stated.
They can intend what they please, but the facts show that you can't save the elderly without quarantining and social distancing of the non-elderly. "Stiff upper lip" is such a caricature of Britishness that I wonder if Johnson is doing it as a piece of patriotic method-acting. It is not a medically sensible method to fight COVID-19.
