It is interesting that you didn't disagree, but more interesting that you jumped to the conclusion that not wanting to have an open forum means people don't want the students to think critically.
Discussions almost always lend itself to opinions and the you either spend/waste part or most of the class dealing with said opinion.
Hi Gigabyte71, sorry to see you think you are a mind reader. Did you see where I said I did or did not want students to think critically? Addressing the views of other, either spot on or mistaken is important to those who think others are more important than ourselves.
I recall one teacher who spent a great deal of time preparing and would deflect and evade in order to get through all his points. As the students were leaving the class, I overheard one remark he had no idea of what was said.