Should teachers indoctrinate or educate?

As another school year comes to a close, I realize how much I will miss (most!) of my students. Being a teacher has wonderful intrinsic benefits, the best of which is the relationship that we build with our students. But I am deeply troubled by the knowledge that there are teachers, certainly some on my own campus, that use their power and position as a teacher to indoctrinate students to their own political and/or religious viewpoints. One such teacher at BHS has a reputation of freely speaking about his own views and blasting any student brave enough to speak in defense of a contrary position. Some have even reported that they are graded lower on assignments because of their own views or beliefs. If this is true (yes, students have been known to exaggerate) then this behavior by the teacher is, in my opinion, an actionable offense. It is one thing to speak of one's own beliefs if it is relative to the subject at hand and is clearly stated as one's point of view. It is quite another to enforce a belief system in class and bully students into conforming to it.