Why Join?

Here's an actual conversation I had today...
I'm obviously Mr. S, and my students are named using only initials. This takes place right after lunch, on a sunny, but cold, December morning.

DH: Mane, why y'all hurryin back to class? You know we're just gonna have to do work when we get there.

PW: Yeah! We always be doin work in Mr. S's class.  Some teachers around here don't make us do nothin. Like Ms. B last year.

DH: They just don't even care what we doin in their room. Some teachers just don't be doin their jobs.

Mr. S: What did you say about that teacher from last year who didn't make you do anything?

PW: She just didn't even care.

Mr. S: Why would you say that?

PW: She didn't make us do anything.

Mr. S:Oh, so the amount of work teachers give you tells you something about them?

PW: Yeah, you always be pushin us and tryin to make us do better.

Mr. S: Yeah, and why do you think that is?

PW: You care.