Are pro sports rigged? nfl, nba, ?

I think so, how about games where neither team can move the ball, but as the 4th quarter goes along, all of a sudden, neither team can be stopped. Why do teams use the prevent defense, when it never works! You were able to cover receivers the whole game, but now they decide to lay off and let the other team complete pes. Why do they only call holding, when a team throws a touchdown p? The NFL wanted the Saints to win last year, they were given every call. And the NBA doesn't want Tim Donaghy to talk, he can't be the only ref to go rogue.