I'm a connect-the-dots kinda guy, especially in this case...
Tell me how else to interpret this paragraph: 'I am determined to see that justice is served in the death of Colonel James Sabow, as a step toward establishing the truth of events such as the September 11 demolitions and institutions such as the coup regime of 1963 that maintains itself in power through the global drug trade, financial corruption, and murder, among other crimes.
September 9/11 DEMOLITIONS - he believed the 9/11 was an inside job. ie: he is, by definition, a 9/11 Truther. Case closed.
But wait, there's more.. 'coup regime of 1963' is obviously a reference to the JFK assassination, and the conspiracy theories surrounding it.
So he believed both JFK and 9/11 were 'inside jobs' or, as succinctly put by Alex Jones et al at Prisonplanet, 'False Flag' operations.
So he decided, apparently, to retaliate against 'the system' by shooting some random guards at the Pentagon. Gee, that's really brilliant. (not)
Thinking of that homegrown terrorist Timothy McVeigh, he focused on the controversial deaths of the Koresh followers in Waco, Tx, at the hands of overzealous ATF folks. As murderous as McVeigh was, his complaint was a lot more substantial than those of 9/11 Truth.
With thousands of unstable, angry and paranoid white men reading countless mythical, angry and paranoid accounts of the US government's (bush regime, as commonly referred to by truthers at JREF) false flag operation to murder 3000 innocent people, it's just a matter of time before more of them take random pot-shots at government personnel.
It is America's 21st Century witch hunt unfolding as we speak...