My undergraduate courses had professor evaluations. Using these evaluations unilaterally to fire professors is ridiculous, considering the varying incentives st

My undergraduate courses had professor evaluations. Using these evaluations unilaterally to fire professors is ridiculous, considering the varying incentives students have, the various reasons that professors end up teaching the courses they do, the various values that individual professors bring to university other than teaching, the various ways professors can improve given the right resources and support, etc. But there are poor professors who are evaluated poorly by students yet teach year after year with no improvement. So the problem is that the evaluations are not being used properly -- by professors and administrators -- to make the necessary adjustments. Shouldn't we be firing the administrators?