well in my view democrocy places too much power in a small group of people, the government are able to make decitions regardless of public opinion and as they say: "power corrupts and absolute power corrupts absolutly"
i will admit that it doesnt all add up but there are also eye witness reports stating they saw the aircraft flying very low approaching the pentagon. Its more a case of who you are more willing to believe but the overall distrust in the US government probably causes alot more of these theories to be produced.