Interesting topic.

I'm sure its possible for an instructor to allow their personal bias to reflect poorly on a student's grade when the subject matter is a topic that is widely debated.

That said, without reading the actual paper and knowing the grading criteria, there is no way of knowing if that is the case.

Be careful of calling it bias, IE, don't cry wolf. There may be sound mechanical reasons as to why your paper was graded like it was.

Its been a while, I graduated in 1998 from Texas State and writing papers pretty much saved me. It was something I was really good at and I could BS my way through just about anything. I don't recall, however, having to write anything over an emotional or politically charged subject....I was a Finance major.