I think this is a much more reasonable argument than what your original comment seems to say, and I agree with you that an insufficient knowledge of history is

I think this is a much more reasonable argument than what your original comment seems to say, and I agree with you that an insufficient knowledge of history is harmful, and this should really be made clear in high school-level history. But isn't this true somewhat of most subjects? Consider, for example, the deplorable state of software security, or the harm caused by people who misunderstand probability. (One caveat: no subject can be compared in this regard to law and medicine, where other people need to be able to trust practitioners with their lives.) Also, why should this mean the historical society shouldn't encourage more people to study history? When I studied history I felt that I was imbued with the importance of approaching history carefully.