Being an art teacher isn't an excuse. Everyone should have a basic grasp of the issues and I would argue that being a teacher in any subject elevates that from "should" to "must."
I would hope that art is in our schools not merely to promote a leisure activity but to examine different ways of viewing the world. Doing that requires more than just drawing counterfactual maps.
My favourite was a report that showed a percentage increase in profit that was higher than the percentage increase in revenue. Is that not the very definition of "higher margin?"