I am not entirely sure of this btw. We've seen a number of very short-lived successful coup de'etats in Ecuador which can only be under the assumption that the military seized power to make a political statement on behalf of protesters, and then quickly relinquished power. Additionally I have to wonder about Felix Sulla's restoration of the Roman republic near the end of his rule. I think it is likely that these are exceptions that prove the rule but "no one ever" is way too broad to be true on its face.
I think the larger problem is that organizations have a will to live independent of their members, and killing an organization is hard. What is the object of surveillance? It depends on who you ask. For the government agencies involved, this is a matter of extending their territory and so your view may hold some water there, but for a wider class, the object of surveillance is money, and they are the ones calling the shots I think.