Sounding like a born-again social conservative, president Lyndon B. Johnson stepped to the podium and made this stirring pronouncement: “When the family collapses, it is the children that are usually damaged. When it happens on a massive scale, the community itself is crippled.” And with his usual modesty, LBJ later hailed that 1965 Howard University commencement address as his “greatest civil rights speech.” A few months later the Moynihan Report came out. Despite its commonsense focus on strengthening the Black family, civil rights leaders raised a stink that Mr. Moynihan was trying to “blame the victim.” Floyd McKissick, director of...