[clef]

If the NSA is all knowing as everybody seems to think, why aren't all criminals in jail by now?

[drcube]

Because they're not the police. And the jails are already full.

[mikeash]

Also the criminal justice system doesn't accommodate evidence obtained through the NSA's methods.

[dllthomas]

Of course they're not "all knowing", but this is a poor argument - if they were all knowing, would we expect them to put "all criminals in jail"?

[jeremyjh]

Because so many of them work at the NSA.