Abridging the freedom of speech?

I disagree with pretty much everything that this guy has stated--or at least with the context that he uses to frame his statements. But don't we want our kids to learn how to think critically? Isn't this the point of education?

"Now I'm not saying that Bush and Hitler are exactly the same. Obviously
they're not. But there's some eerie similarities to the tones that they use.
Very, very ethnocentric. We're right. You're all wrong. I just keep waiting. I
mean, at some point in time I think America and Mexico might go to war again,
you know? Any time Mexico plays the USA in a soccer match, what can be heard
chanting all game long? (student answer — unintelligible) Pretty close. Pretty
close. Now, do all Mexicans dislike the United States? No. Do all Americans
dislike Mexico? No. But there's a lot of resentment, not just in Mexico, but all
across the whole world, towards America right now." (Check out the entire
story--or at least one of them--here.)

When does the age of non-impressionability begin? Am I still impressionable? Is that a legitimate argument to stifle the opinions of an educator? of anyone? Is it okay for students to be exposed to Howard Zinn? Is it only okay if they are also exposed to Paul Johnson? I mean, I understand the desire for objectivity, but that's a myth. Even if its implicit, teachers are human beings and have biases. Why not admit those biases up front, and challenge students to develop their own, based on as much knowledge as possible? I guess this is the unpopular position to take on this story. Most I have talked to today say that the teacher being put on administrative leave was appropriate. I say, long live debate and the free exchange of ideas. If this guy wants to put his liberal mantra out there to be absorbed, then let someone counter with her conservative response. Are we afraid of truth? Is that why we have decided that there is none? It's just all spin, now. If I get 5 minutes to espouse my views, then you must get the same 5 minutes. Regardless of how ridiculous my argument--or yours--may be, it's only fair to get equal time. Our political debates are canned. Our media is canned--and sensational--and ratings driven. Our education is canned and a farce at best.

Disgruntled, (could you tell?)
dt