I'm not familiar with the Oxford Union president. Jian Gomeshi was credibly accused, the fact that he was found not guilty does not mean his accuser was false. I don't know why you include Emma Sulkowicz, I know of no evidence at all that she falsely accused someone. Also Jian Gomeshi is writing articles for the New York Review of Books and the man Emma Sulkowicz accused graduated, so neither of their lives were ruined.