Mayhem erupted outside Columbia University’s graduation Wednesday as some students burned their diplomas and cops tussled with dozens of rowdy demonstrators, arresting at least two. Protesting anti-Israel students inside the Upper Manhattan ceremony also tried to drown out acting President Claire Shipman’s commencement address with raucous chants of “free Palestine!” and demanding the release of former graduate student Mahmoud Khalil, who was detained by ICE agents in March and is currently awaiting deportation. Last year’s commencement had to be canceled over safety concerns after an anti-Israel encampment protest engulfed the Morningside Heights campus for weeks during the spring 11 Columbia...