The short and almost depressingly obvious answer is because Obama.
Interviews with residents of this community illuminate the distrust that has developed across deeply conservative America — fueled by anger at the White House and Congress and a sense among many that the federal government is no longer on the side of the people it is dedicated to serve.Which, I suppose, is a given. If you're the sort of rube who is so hostile to the first black president that you're already willing to believe he's a secret Kenyan, or Muslim, or any of the other things that even sitting congressmen were willing to pipe up with then believing he's going to use his secret Muslim powers to brainwash the military into invading Texas is not much of a step. I wish, however, we put more emphasis on pointing out that people who believe these things are not "conservatives" or "patriots" or any of the other things they wish to be called. They're mostly just deeply stupid.
“What comes home in the conservative consciousness is: The government is hostile to me,” [Bastrop County GOP chair so-and-so] said. “And if he’s already unleashed the IRS on us, is it a big leap to think he’d unleash the military?”Yes, actually, it is a very big leap—even if you have convinced yourself of the hostile and IRS parts, "and now the military is going to invade Texas" is indeed a leap. It speaks to the mind-set, though; this other fellow is my enemy. Therefore, he is conspiring against me and doing illegal things, and about to do not just illegal things but nation-shatteringly loopy things. Because I am freedomz, and he is not.
It's particularly interesting that this national conviction among conservatives that they are being terribly oppressed comes immediately after a period of wartime rhetoric in which non-conservatives were, literally, called traitors to the country; one change of presidents later and the Texas governor makes noises about his state leaving the country altogether if that same can-do-no-wrong government starts doing things he isn't fond of. These people don't do nuance. When they are in power they proclaim themselves the only true Americans; when they lose an election they are convinced it is precursor to America collapsing entirely.
Head below the fold for more on this story.