Most viewers of the October 1 vice-presidential candidate debate, even those who thought J.D. Vance won overall, had to acknowledge that his weakest moment was right at the end, when he evaded questions about his running mate’s insurrectionary denial of defeat in 2020 and tried to depict Facebook “censorship” of news stories as a bigger threat to democracy than the violence Trump supporters carried out on January 6, 2021. Notably and fatuously, Vance...