Because the attack on the World Trade Center would just scream that they were coming for the Pentagon next. The wouldn't destroy the white house or capitol, but they would certainly pick the Pentagon at random and blow the hell out of it. They would cost themselves billions of dollars off of a hunch. They wouldn't even warn the people that work at the Pentagon, they would simply blow it up without regard to human life. Think about it for a second. It makes no sense.
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