OPINION By THÉRÈSE MARGOLIS Ah, the fickle love of an authoritarian president. When Mexican President Andrés Manuel López Obrador (AMLO) loves you, you can do no wrong. His buddy-buddy Félix Salgado Macedonio — who was repeatedly accused of rape, embezzlement and close ties with drug cartels, but still managed to garnish the governorship of the coastal state of Guerrero, albeit