Scientists who wish to question evolution without risking their job can go to work for the Discovery Institute, the Institute for Creation Research, or any other organization which supports their beliefs. Why should institutes of higher education, which are primarily concerned with teaching students what we already know, have to support activities which do not further that goal?
Scientific failures that follow the scientific method are very valuable teaching tools. Not every scientific theory is a success. Students need to know this and know that they have the ability to test all past scientific theories and laws.
If not science has no value.
My point is that no scientist should ever be fired because his work is thought to be against the current laws of science.