A terrible "side effect" here (apart from statistics of party membership) is creating what I call a subtle, destructive habit in the classroom where students only recognize or understand what has been repeated. Whatever is heard for the first time is forgotten. Learning is no longer a discovery, but a confirmation of indoctrination. Students only recognize something as knowledge if it has been drilled into them. Even if it is critizised, they will not understand the criticism but only only parrot the original theme.
No one wants to get on their professors' bad side. The brighter students quickly know what they're expected to do to get good grades and if they have opinions that are not welcome in the classroom or on campus, they keep it to themselves.