Brian Rosenwald of the School of Arts & Sciences spoke about Cumulus Media, a talk radio company that has instructed employees not to spread misinformation about the presidential election. “Cumulus has a big, broad set of interests—they have advertisers, sports contracts, nonconservative podcasts, dealings with the F.C.C. over station licensing,” Rosenwald said. “They understand that if you get involved in something that risks instigating violence, there’s a serious danger to the bottom line.”