Four years ago, a lethal contagion spread across the United States. A plague of cowardice far deadlier than the coronavirus gripped school administrators throughout the land. And it claimed among its victims the high school seniors of 2020, who saw their graduation ceremonies canceled amid the panic. This spring, many of those same high school seniors of 2020 stand poised to graduate from college. Sadly, however, in some places, they now face a new variant of that familiar contagion. In a viral video posted on the social media platform TikTok on Thursday, one University of Southern California …