Earlier quoted context omitted.
Between people who fight for expensive and inconvenient procedures in the name of a particular existential threat, but when pressed admit that the methods are not at all effective for that purpose - an enormous difference between those people and people who have a different motive than they claim to have? A minuscule difference. If you support A to do B, but admit that A doesn't do B, then I assume that you support A…
The main difference is what they believe they're doing. I seriously doubt that most or many people at the NSA think they're in the line of "suppression of dissent". Even though people doing the wrong things for the right reasons can cause a great deal of harm and should be stopped, it's still less of a threat than people doing the wrong things for the wrong reasons. For example, I doubt anyone from the NSA would show…
For example, the Chinese internal intelligence services were likely not attempting to "ruin [anyone's] lives"; instead, they were probably trying to limit the damage a purported "human rights lawyer" could do to their society's stability. Unlike you, I have no doubt that United States (or any western) intelligence service would use similar tactics for similar perceived ends.
And if you want evidence of that, I'll just point you to the entire discussion of the justified use of torture after Sept. 11, 2001.