I agree. And it ties into something I often see that puts me on edge: programmers not taking responsibility for the code they put into their projects.
What I mean is that when you incorporate any code, from any source (library, framework, copypaste, etc), then you are responsible for that code and its proper behavior as much as for the code you actually wrote. So you're well-advised to understand it.
That's one of the reasons why I won't include code that I don't have the source code to. I need to understand it and be able to fix it.
