That's why

From Things We Forget.

Wannabe Basketball Boy: Why are you giving me a detention??!! I don't care if you give me a detention!

Me: Why? ::deep breath in preparation for the follow::

Why am I giving you a detention? Because you just did something that, if you were caught doing it out there in the real world, people would either think you are a criminal - or that you are mentally insane.

Frankly, I don't care that you don't care right now - I care that I care.  Because I do not want you to grow up thinking it is OK to take someone else's eraser and put it in your mouth.

I DO care that you grow up right, with socially acceptable manners and decorum. I DO care about my job as your teacher, so I care about doing everything in my power to help you realize that some day, you are going to care. And you ARE going to care, because I cared enough to interrupt any actual teaching right now to call you out on your shit.

This is me caring, kid. And all your attitude isn't going make me stop.