"This is the kind of class that attracts students who actively want to take it: students who are already interested in programming."

I would love programming to be more accessible and a much more diverse community, but I think people are starting far from the problem.

Look at the percentage of K-8 teachers teaching Math and Science that did not major in their field. Now look at the ratio of female to male teachers in both K-8 and pre-K.

We are not providing proper role models in the math and sciences since the teachers teaching the subject didn't consider them in detail enough to major in them. Neither are we providing proper role models for both sexes professionally interacting. The problem is long standing by the time students pick majors and their perception of STEM is long formed. Their are reasons you have to be already interested to succeed and it has to do when "already" happened.