You are looking at one tree in a very large forest and disregarding all the others. I have answered your question, but you don't like the answer. Whatever object crashed into the Pentagon likely knocked down the light poles, a chaotic event.
Why don't YOU or your narrow-minded and gullible mates prove that the only way for the poles to be knocked down was by a 757? You won't because you cannot, and we both know that.
In the meantime you ignore all the other facts and evidence. Small mind CC, a very small mind poisoned by years of propaganda.