Conservative author Stanton Evans, who died of cancer in 2015, was every bit as bright as Buckley, and more kind-hearted. A new biography by Steven F. Hayward is out to re-apportion praise. — M. Stanton Evans: Conservative Wit, Apostle of Freedom. By Steven F. Hayward. Encounter Books; 400 pages; $33.99. Someday in 1970, William F. Buckley Jr. told Playboy magazine that the biggest problem facing the conservative movement was “a scarcity of good writers and journalists”. What seemed like a yawning shortfall then…