I don't know if I agree about "never being able to learn programming," maybe with the right intense tutoring those people could. But double-humping is easy to

I don't know if I agree about "never being able to learn programming," maybe with the right intense tutoring those people could. But double-humping is easy to explain: some people embrace the mindset and problem solving approach of programming naturally, or with minor counsel; while some people simply approach their programming assignments as a bunch of solutions they have to memorize so they can replicate them on the exam. It's quite similar to the approach I've seen most engineering students take to Calculus and Physics when I was doing Engineering. Obviously, wanting and liking to learn programming also plays a major role here, and I'd say that even within computer-related degrees many people end up avoiding programming courses, on the grounds they can still work in the field by going the IT route.