Grenfell Tower, the London skyscraper that recently burned in a fire that killed dozens of people, was a public-sector housing project managed by an essentially public-sector firm that had a history of ignoring its residents’ pleas for fire prevention. So what does Jeremy Corbin blame for the tragedy? Too little government, naturally.

Corbyn says that he is very angry at what happened, which he links to what is known as fiscal austerity—that is, when government spends only 108 percent of tax revenue, instead of the much higher percentage that he favors. He skated over the part played by the public sector in the tragedy…