A statue of the University of Southern California’s mascot Tommy Trojan has been spray-painted with the words “say no to genocide” as on-campus tensions persist in the wake of the college’s decision to cancel its main commencement ceremony. On Wednesday, more than 90 people were arrested at a pro-Palestinian event held at Alumni Park — a green at the heart of the USC campus. The graffiti incident appears to have occurred during a second protest held after the initial arrests. Much like Columbia University, in New York, members of the public are now barred from campus and the school’s gates are…