Well, so, why can't they?
This little teaser at the NY Times tempted me for a moment to become a subscriber to TimesSelect, their pay-for-view columnist service:
Why Righties Can't Teach
By JOHN TIERNEY
Published: October 15, 2005
Liberals on campus have become so used to hearing their opinions reinforced that they have a hard time imagining there are intelligent people with different views.
Sounds intriguing, especially for the NY Times. But I managed to resist.
Then again, it's a sentence that actually does quite well standing alone, a succinct explanation for a common phenomenon.