The One Party seems to have been preparing for and wanting domestic conflict. If a civil war situation arose, as they control the military, police, and specifically "the NRA member minds" (which makes it different than the collapse of the Soviet Union), they'd be able to do more rapid Domestic Cleansing than is already taking place. If they can't manage to induce civil war/rebellion, they can gradually ramp up the institution destruction more, making the unwanted essentially domestic refugees, and with no help, The Few alter the demographics the way they want and get a cleaned slate to work with.