Kids, especially those up through 10th grade at a minimum are very impressionable and honestly, don't have a lot of common sense yet. We have too many teachers that are indoctrinating kids before they are old enough to know better. Teach the kids actual history, based on facts, math, english, etc... leave it to the parents to talk to them about morals, etc...
Parents, step up to the plate and be an actual parent, not a friend.