Radical anti-Israel activists told Columbia students, “there is nothing wrong with being a fighter in Hamas” — weeks before the campus exploded in pro-Palestinian protests. In a two-hour tirade to the hardest core of anti-Israeli activists at Columbia and its sister college Barnard, Charlotte Kates, the international coordinator of Samidoun: Palestinian Prisoner Solidarity Network, said, “These are the people who are on the front lines defending Palestine and fighting for its liberation.” The endorsement of…