At least in political science (I suspect also in other disciplines), there is a common ethic of political neutrality, at least in teaching. This makes overall sense: we don't want to indoctrinate students but help them learn about politics and form their own opinions and political identities. In mainstream political science, at least, such a neutral stance is also taken: We just study what happens, we're descriptive, not prescriptive. Of course, critical theorists have debunked such pretend-neutrality as a particular status-quo oriented value bias.
I suspect that other disciplines have similar written or unwritten neutrality norms. A few years ago, my institution adopted a (very laudable) program in ethics education that offered a range of approaches (they were called "key questions") and engaged students in using these questions whenever they encountered ethical decisions. The questions did not favor any particular ethical outcome; in fact, any decision could usually be justified by at least one of the key questions. Value neutrality! (This is partly justified with a reference to ethical dilemmas, in which no outcome is clearly good or evil. I should add, though, that the perception of a dilemma seems, at least occasionally, to be contingent on our highly individualistic "Western" value system, which is more accepting of openly amoral choices as long as someone comes up with a forcefully presented defense of them.)
What I find paradoxical about value neutrality in our teaching is that we take this stance in order to help students develop their own values, political views, identities; but by pretending that we are value neutral, we privilege NOT having values. In other words, we want students to make well-reasoned, carefully considered value choices while performing the roles of those who eschew value choices.
Obviously, who are we shitting? Not our students: they know that we hold values, and they imagine what they might be. I don't think we are helping them become good, moral human beings by pretending we are moral and political blank slates.