Maybe you're missing the context. The last time a group of states tried to leave we had a war about it. The confederates lost, are generally considered to have been in the wrong, and basically cemented the precedent that if any state tries it again they'll get the same result. Everyone pretty much assumes that if Texas really did try to leave it would result in armed conflict, with the scale likely determining if we call it a civil war or not. This is more making fun of the laughable claim that Texas could win in such a scenario, since the US military is better funded than the next 4 or 5 best funded militaries combines. It is generally assumed that the federal government wouldn't fight for Texas for the aforementioned historical reasons. Also there's not 72 million people in Texas, there's around 30 million, and many of those 72 million gun owners wouldn't fight for Texas. I'd hazard to say most.