And how would we fight an enemy that has access to extensive resources, an army, high-tech weaponry, satellite-based tracking systems, and God-only-knows-what-else the federal government likes to hide in its private little nooks and crannies all over the US?
Ideally you would aim for subterfuge and utilize skilled hackers to crack government databases, but in terms of pure martial prowess, autistics would be laughably out-matched; in short, we'd all be killed.
Hiding might work if you're very high functioning, but wouldn't do you much good if you're on the opposite end of the Spectrum, so that's out. What makes you so sure the government wants us all dead, anyway? I find myself intrigued.