Teachers of calculus should have to justify why people should learn it, given 99% of them will never use it, and could be taught something else challenging that

Teachers of calculus should have to justify why people should learn it, given 99% of them will never use it, and could be taught something else challenging that they will use instead. But the same does also apply, and get called out just as often, regarding the humanities, especially given 99% of people can fulfil their humanities interests for free and at their leisure and on their phone with Wikipedia.