Most of us that will argue with libertarians until we're both (all?) red/blue in the face believe that government is useful, necessary and generally a good thing (TM) for a variety of reasons.

But do no wrong? That's a massive exaggeration. YOu can believe it does a hell of a lot wrong, in fact nearly everything, without believing we'd be better off without any government at all.

Most of what the government does is wrong, or at least terribly inefficient, so the less they do the better.