they are just plain arrogant, and this is a fact.
Look at how Ron Paul pretended to be "champion of the constitution" without even earning that title. Did he win a competition or something? nope he just simply assumed that his view of the constitution was superior to someone else's view, and anyone who thought otherwise was simply deemed anti-constitution.
I don't see how this is any more unfair than any of the claims 'progressives' like to make about looking out for the interests of the working class or unfortunate or christian conservatives do with 'morality' or 'family values.' Spin and framing like that is everywhere in politics. At least with Paul he can point to issues like the Patriot Act or Drugs where he consistently took the civil libertarian stance, even if we might disagree with his particular kind of strict constructionism.