This is like saying "whats the difference between a cow and a goldfish both of them are alive".
No, it's not. The Stasi used the exact same argument for wiretapping all of East Germany: 'National Security'. And to wit, there are still oodles of Ossies who think it was a good thing to have done.
Now, I grew up being taught by my parents and by my teachers in school that communism/socialism was evil and that wiretapping your own citizens was evil. That America, the one I was raised in, has seemingly disappeared.