There is considerable money at stake for the organizers of Super Bowl and for NBC (CMCSA), which will televise the game. No insurance, no game. It is thus not surprising that the NFL has joined with other professional sports leagues and 80 business groups nationwide to form the Coalition to Insure Against Terrorism (CIAT) to urge Congress to fund reauthorization of the TRIA legislation.
A bit of background on why insurers changed their view of terrorism coverage after 9/11 provides the relevant context. Before 9/11, insurers included terrorism coverage in all commercial policies without charging for it because the risk was below their threshold level of concern. But after paying $44 billion in claims for 9/11—at that time the most costly disaster in the history of insurance—most insurers excluded terrorism from commercial policies.