Q doesn't make predictions, nothing is perfectly certain because they're fighting an enemy, tactics change, newfag.
We're not just trying to save "people" here, it's preserving the system and using it to our advantage. We can kill all of these people, sure, but 90% of The People are blatantly ignorant to what those people do wrong, so they'll just be taken advantage of again. If they don't wake up to the wrongs, then there's no point in going after them at all.