There is no point in the infinite arguments put forth by governments where the results of policies, confirmed or denied, end in a transparent result which is harmful to citizens. Anyone can measure an outcome and from that outcome know of the underlying truth which produced it.
The very premise of ‘plausible deniability’ is a fictional escape hatch for governments or individuals to evade the obvious. The devisement is merely a means to avoid liability for bringing about an undesirable or hurtful outcome. The entire premise requires persons in power to lie. As a social or political construct this could not be worse. It assures that there are no checks on the unethical use of power. Wikileaks has succeeded only in providing an objective confirmation of what we already know to be true. This is no different from political finance where we know it’s no less than a legal form of political bribery which consistently produces undesirable outcomes and is harmful to citizens. That we have evolved such an obscene contrivance is irrefutable evidence of a system gone horribly wrong.