That sounds pretty dumb to me. If they are still using September 11 as the reasoning, "An NFL spokesman said the league had actually first curbed Super Bowl tailgating after the Sept. 11 attacks," then they should cancel the Super Bowl altogether. Or at least screen all people before coming into the parking lot.
Seems to me the NFL was not selling enough $12 beers inside the game.
With the lights out, it's less dangerous.