We should all care about bad developers because if they make bad products sooner or later you or I will use one! Bad developers are the ones who store your password credentials and personal information in plain text. We should all care about making it easier to do things the right way because then the right way happens more often.

This is one of those things that are obvious in the specific, but we're talking in abstract terms.

Because I am very often (temporarily at least) a bad developer. I am tired, or sloppy, or unmotivated by a particular project, and I make mistakes. I want my tools to help me.

Most people, in my experience, are both good and bad developers in different measures. Tools that help the bad developer therefore help all developers in those moments when we make mistakes.