Jade Helm isn't really stirring up anything new. It's just providing a convenient lodestone for all the crazy that's already out there. Years ago, when I was driving on the stretch of I-35E between Dallas and Waxahachie, there were billboards -- big ones! -- with pictures of soldiers and tanks. "Could U.N. Troops Occupy Texas?" asked one. (Answer: No. U.N. troops can't keep order in an economically-collapsed country roughly the size of Rhode Island. They wouldn't stand a chance in Texas.) Another sign announced, "Marshall Law is coming!" (I don't know who Marshall Law is; I presume he's the rural equivalent of Judge Dredd.)
There was a phone number. I called it. The minister who answered sounded painfully embarrassed, but he insisted that the Bible said that this stuff was really going to happen. I explained about the need to verify one's spelling choices before purchasing large and presumably-expensive billboards with one's phone number on them. He thanked me stiffly and hung up.
There are people who are genuinely scared of this. (I suspect there are also people who are genuinely excited by it -- or at least excited by the prospect of taking up arms and turning back the tide. I further suspect that a lot of these are the same people.) They may not know how to spell Martial Law; they may not be entirely clear on what Martial Law actually is; they may not realize that the federal government has no need to take over Texas, since it already did so back in 1845 at the request of Texas. But they are out there, and they've been out there a long time.