i think you've misquoted/misinterpreted me, but am not quite enough an internet-psycho to go searching through 100,000 posts to get to the heart of it  
  
actually, page 1 of all my class syllabi states my official role as "devil's advocate," to tell them they're wrong no matter what they think - it also says that, while i set myself the goal of being as neutral as i can see to be (and our opinion of what is "unbiased" is just that, afterall, an opinion, and to say hitler was an asshole is certainly a biased statement, but one few would believe to be), any student with half a brain and a bit of interest will be able to see exactly what my true political opinions are after a few weeks of close observation, and that they'd be as wrong to swallow my true opinions hook and all as those of their friends, parents n' priests. 
  
at any rate, the role of a public teacher is of necessity different from a newsman.  i have a choice to not watch an admittedly conservative talking tv-head, my kids don't get a choice about showing up for class though.