Did Portland State Overreact to a Reported Threat?

Portland State University expelled and banned from campus a graduate student who a classmate said had made threatening remarks involving guns and a professor, The Oregonian reported. The article describes how the university acted quickly after receiving the report and about how Henry Liu says the university unfairly viewed him as, in his words, a "crazy Asian shooter." Liu denies making the remarks attributed to him, and a psychiatrist concluded that he poses no danger to himself or others.