Law is fairly clear about self defense.
So too is our constitution about the tools available to us to defend ourselves against government. We are guaranteed the right to petition for redress, and the first and second ammendments of the constitution make due process clear.
That standard of what constitutes a threat from a government against an individual citizen must be high, and, bloody hopefully, it should be as narrow as possible.
But, exactly what is that standard, that is my question for you.