The Bubba Effect
Grandmaster
Unalienable rights are inconvenient, aren't they? But you either believe in them, or you don't. In your latter example, 50K armed Chinese nationals would be surrounded by 15M armed Americans. As long as they behaved themselves in accordance with US laws, there wouldn't be any need to worry about them, would there? And if they did misbehave, how would that be different from an equivalent number of US citizens doing the same? Both groups would have to be brought to account, presumably, for your purposes by use of force.
To be clear, I am stating that a nation has the right to resist invasion from a foreign army.