They are in the minority, I do agree with you. But it does not take much when honors programs are often made or missed by hundredths of a point.
I had some great professors that I disagreed with on almost everything. My mentor was a lesbian latina follower of Andrea Dworkin, who openly shared her Gramscian view of the world with anyone who would listen. She was respectful of others and what they brought to the table, and used disagreements as a jumping off point to some great debates that helped people on all sides of the argument. Differing opinions create opportunities for growth for everyone in the classroom. Some professors do not see it that way... they see it as a personal affront. The majority of people in the academe are indeed tolerant, but that does not mean that professors who are not tolerant cannot have huge effects at important times in a student's life.
One of the professors I disliked the most in college was a conservative. It's all the the way in which topics are approached. The higher-education classroom should be a place to exchange ideas and engage in open inquiry... rather than indoctrinate students to mimic the professor's ideology. I still laugh at the papers I wrote for my Political Economy class... there was not a single position paper I wrote for that class that I really believed in. "Free Market Failure: The State as Guardian of Morality."