1. The system doesn't make mistakes

2. The system represents the underlying reality

3. The system can be implemented

Let's see how that plays out here:

1. You're a US citizen. While returning from an overseas trip, a border agent thinks it's a bit weird that you have 3 laptops and flags you for extra screening. Unfortunately, the box for "extra screening" was right next to "fraudulent passport" and they checked the wrong one. You say you're a US citizen. The box says you aren't. No due process? Straight to gitmo.

2. You're in the US on a work visa sponsored by your benevolent megalithic software company. Unfortunately, they engage in some right-sizing by sizing you right out the door with zero notice. It's policy for immigration to retroactively extend your status if you find another sponsor or a different visa. But, on paper, the moment you were terminated you lost your legal status. And, just your luck, immigration agents are waiting outside as you carry your stuff to your car. No due process? Straight to gitmo.

3. You've never had a passport because you grew up in the US and have never travelled internationally. An immigration agent stops you and asks you for proof of your status. All you have is your old (pre-REAL ID) driver's license, but the agent says those are easily faked. Maybe you could go to your parents' house to look for your birth certificate, but the agent wants proof now. No due process? Straight to gitmo.