The latter method I think is unwise and has a next to zero chance of success.
I believe it is an absolute last resort and it would be costly to the people, the U.S. population and the country as a whole. However, American citizens on average are heavily armed and with the number capable military veterans at an all time high I believe that you sir underestimate the people.
x's 2 josh . i think if it hit the fan and everbody had to pick a side , patriots would come out of the woodwork and the " others " would melt away pretty quick .