A more effective strategy to constant surveillance is to simply raise the background level to just below actionable threshold, so that way their intelligence is effectively useless. That is, really, you should just sit around all day and talk about how you dislike what they're doing, think they're career criminals betraying the nation, that you want to actively do something about it, etc. Bonus points for mixing that conversation with discussion about how you'd like to tour DC and see the various monuments, including the Washington monument, Lincoln memorial, and WWII memorial.

If the background unhappy chatter is close to actionable (or is in the mind of the classifying algorithms), then actionable chatter (eg, actually planning an attack) can only be distinguished from background chatter near when the plans become "active" in some sense, and likely too late to meaningfully respond to. (To use a physics analogy: if you try to predict cavitation in flowing water really close to boiling, it's harder.)

In many senses, simply embracing openly that we're very angry as a society, even in the face of constant scrutiny, prevents that same constant scrutiny from determining when we're planning something. It can only really tell that we're pissed off, in general.