Not to worry: After President Paul dismantles the national security apparatus, ends all foreign deployments and closes Guantanamo, history is sure to repeat itself.
So we'll get another chance.
I guess you mean "after President Paul brings the national security apparatus back within its Constitutional limits".
The Nazis had a very efficient national security apparatus. A totalitarian one.
If America "needs" to have a similar apparatus, made even more powerful than Nazi Germany when leveraged by technology, then the terrorists will have already won, because there will be no Constitutional America left to defend.
What the NSA was doing was an unconstitutional abomination, and Senator Paul (however wrong he may be on other issues) was absolutely right to do everything in his power to expose and destroy it.