It's more likely based on the limited physical damage to the Pentagon and the lack of debris that proves a 757 hit it.

Ooh. Let me try. This is begging the question, am I right?

Why should there be more damage than what was recorded?

Turbonium, how do you square your complaint about the minimal damage with your complaint that no serious effort was made to find a bomb on the plane? Wouldn't the lack of additional damage argue pretty effectively against the possibility of a damage-adding bomb?