Yes. Personal political preferences should be left out of the classroom, and only facts/history should be presented.

I totally agree. Both capitalism and communism in their theoretical forms have great things going for them, but in practice both have some really bad points. I think that kids need to understand the principles and practicalities of both, and there is no better teacher than history.

Personal politics should not enter the equation. Like religion, a teacher should encourage kids to investigate, explore and understand, and even to take a stance, without ever telling them which to chose.