When big men get in foul trouble

The big men are the last row of defense on a basketball team. When they get in foul trouble and have to be taken out of the game, it changes the entire complexion of the defense. That is one reason that teams have to attack the middle of the defense. If they just stand around on the perimeter playing HORSE with 3-pointers, the big guys will never get in foul trouble, and the complexion of the game will never be changed.