Dick Cheney and the Limits of Respect for the Office

So, it seems reasonable to think that one has, as a citizen, an obligation to respect the office of the president, and, presumably, that of the vice-president.

However, presumably there are limits to these obligations--especially, perhaps, for ex-presidents and VPs.

I'm wondering about the limits of these obligations.

And, specifically, about whether Cheney has stepped far enough over the line that we are now entitled to say what we honestly think about that...person.

I'm not talking about gratuitous vituperation. I'm just talking about speaking the unvarnished truth insofar as we can discern it.