Do you have evidence that indicates US citizens are being 'snatched' from the streets of the US without being arrested, tried, or convicted as per the US criminal justice system?
You say it's wildly disconnected from reality and that the NSA's entire purpose is to do precisely this, and if that's the case you should be able to easily show me examples which demonstrate the 'snatchings' are a) occurring and b) the norm.
If it's not conspiratorial fantasy, then the evidence should be in abundance, right?