If the manipulation of the history is not big, the indoctrination will be almost non existent. And let me tell you that I've been kind of indoctrinated by hard

If the manipulation of the history is not big, the indoctrination will be almost non existent. And let me tell you that I've been kind of indoctrinated by hardcore left wing history teachers. They wouldn't stop at teaching, they actively tried to make us think that the left was inherently good and the right bad. Sometimes it even backfired when they were exposed by someone who knew about the topic. Hell, one of my teachers even whitewashed a terrorist group that was still active killing people back then. This may be an extreme example but that doesn't change anything. Bad history teaching is not an excuse to bring more ideologies into school.