This is how I see it;
Yesterday I attended my useless tutorial, where my TA herself doesn't know what she's doing. Someone actually pointed this out to her, which was pretty funny because she was so oblivious to it.
TA: Okay this is on the test....but I'm not really sure how to do it so hopefully we can figure it out.
Girl: I'm sorry but I'm paying for this class and if you don't know what you're doing how are we supposed to know for the test? I come here to learn and you don't teach us.
TA: Yeah....okay this isn't on the test.
Random: Then why are we doing it?
TA: Yeah...don't worry about it. Let's do something else...
Anyway, if I can attend my useless class then I can skip one that isn't mandatory.