Certainty bought by breaking the rule that holds a man's position costs him the position itself.
When the ground goes uncertain, a man reaches for the fastest act that feels like control, and he will reach straight through a commandment to get there. Forcing himself was the confession, since the offering was not worship but a vehicle for certainty, and it was the nearest one in reach.
Fear set the state, the state read waiting as danger, danger dressed a forbidden act as responsibility, and a kingdom turned on that single substitution. The favor of Yahweh was the one thing he could not manufacture, and reaching for certainty anywhere else cost him the throne he was protecting.