Wow, it's sad when educators let their ideology bleed into the classroom. However, i certainly understand how easy it is to let that happen!

As you can probably tell by now, i have a bias towards freedom and human dignity, so it's hard not to let them come through when i teach. Still, i try to be as unbiased as possible, agnostic on the surface, and encourage students to think for themselves. I'd NEVER consider dinging someone's grade for disagreeing on a principle.