I don't think you tell you players not to score unless you are tied, losing by 1 or 2, or winning. In the situation in the game with Auburn down 4, you don't take a knee on the one because a FG can't even tie the game (you have to score the TD). Tied or down 1 or 2, I probably just take a knee to run out the clock and then kick the FG for the win on 4th down.