"The NSA" - who do you mean here? The org in its official function doing unofficial things without oversight? Or the individual working for the NSA spying on his ex-lover for blackmail material?

I mean, either you're saying "no one within the NSA has ever been a bad actor", or you're saying "the bad actions are acceptable collateral damage; no oversight needs to be applied to ensure the trade off between effectiveness and collateral damage is balanced", or you're saying "not ALL actors are bad" and leaving it at that.

And...none of those strikes me as a particular defensible position to take.