If by students you mean Computer Science students, I think the answer is fairly obvious. The subject matter for courses is generally theory, with the programming language / framework / library there as an aid. The professor can't go very far in depth on a particular tool, since it would take away from time he is teaching networking or systems or whatever. Maybe if there were a course called "Real World Programming" or something like that, they'd cover debuggers, but in general I don't see too much wrong with expecting students to read the language / tool documentation in order to accomplish the coursework.
