Bruce Schneier, if head of the NSA, would ask if each surveillance program does enough good to the country to justify it.

That might be a good criterion if exercised by someone conscientious, but it would be too easily stretched, so adopting it would not fix the problem.

Meanwhile, I think it is not sufficient to stop the bulk collection of databases, and the bulk searching of massive databases (as in XKeyscore). We need to prevent these massive dossiers from existing about Americans except when probable cause has been shown to investigate someone.