A tenured university professor in Pennsylvania who previously questioned the Holocaust and called for Israel’s destruction is under fire again for incendiary remarks about Jews, women and gays. Kaukab Siddique, an English professor at Lincoln University outside Philadelphia, asked on Facebook this month whether Bill Cosby’s accusers took so long to come forward because “many women are sluts.” Another recent post on Facebook attributed the Supreme Court’s decision to legalize same-sex marriage on “Obama’s homo uprising,” while a third post referred to “dirty Jewish Zionist White Supremacist thugs.” Lincoln University condemned Siddique’s remarks but said it does not plan to...