On Friday, Paul Nungesser, the alleged rapist of “Mattress Girl” Emma Sulkowicz, had his discrimination lawsuit against Columbia University dismissed. In 2014, Emma Sulkowicz launched her art-protest piece “Carry That Weight,” in which she carried her mattress with her everywhere (including to commencement), as a condemnation of Columbia's handling of her rape complaint. Though the University cleared him of wrongdoing and allowed him to continue with school, Nungesser's name was eventually made public. Last year, he filed a discrimination suit against the school under Title IX (the statute under which victims of sexual assault often bring their claims). In the...