As this guy, Momus, wrote:

Perhaps the problem is actually with the idea of hypocrisy itself -- the idea that consistency is a greater virtue than whatever virtue an inconsistent man might be talking about, and that personal life and public policy must always be girded up and gridded up to resemble each other.

Let me put an alternative point of view. Someone living in a castle, and owning a castle, could very usefully speak about post-materialism. Someone paying five figure utility bills would be in a very good position to talk about -- and act on -- the theme of energy wastage; they would be an expert on it, and have a vested interest in change, and actually have the possibility to make changes on a scale a pauper huddled over a candle could only dream of.

Ad hominem: There are many reasons a charge of hypocrisy might be reactionary and counter-productive. First of all, the hypocrisy mindset pays too much attention to people's personal lives and too little to their programmatic or ideological outlook. If someone is a visionary, or is trying to solve a widespread problem, it's likely that his personal life will reflect the problem whereas his policies will reflect the solution. It would then be pretty stupid to accuse him of saying one thing and doing another -- especially if everyone were pretty much in the same boat, at least until an alternative infrastructure is set up. A charge of hypocrisy might well be a pre-emptive strike designed to stymie future solutions to universal problems.

Consistency above correctness: Consistency is the hobgoblin of petty minds.

Wanting things to be less complex, and wanting people and societies to be without internal contradictions is understandable, but small-minded.

It ignores the fact that it is often only by sinning ourselves that we can learn exactly why sinning is bad. At a certain point we are all saying one thing and doing another. This is, apart from anything else, a sure sign of our complexity, and of our capacity to rise above our current way of living and search for alternatives, no matter how deeply we're mired. Allow it, brothers!

Give me moral perfection or give me corruption: We often strike down people with a spotted reputation only to replace them with people who are unapologetically evil. We hate to be preached at so much that we ignore the sermons we need to hear and prefer unalloyed corruption. At least it's consistent, right? At least there's no hypocrisy there! At least change is taken off the agenda! Thank Christ "hypocrisy" has absolved us of the need to feel wrong, and to make a painful change!

100 people in a room: There are 100 people in a room, all doing A Bad Thing. They know it's a bad thing, a thing that will damage the room and everyone in it, but they can't stop. Suddenly a Visionary makes a powerful and moving speech. "We must stop doing The Bad Thing!" he says. His speech is effective: everyone stops. Except the Visionary himself, who keeps doing it. This, however, is a minor detail: the room is a better, safer place. Instead of 100 people doing The Bad Thing, only one is doing it.

Suddenly a Commentator gets up. "Suckers!" he shouts. "You've stopped doing The Bad Thing, but the man who made you stop still does it! You've been had... by a hypocrite!" Soon everyone in the room is doing The Bad Thing again. But tell me, please, who has damaged the room more, the Visionary or the Commentator? Who has the best chance of helping the room?