[There are a lot of reasons, but Stiles doesn't know if he can sift through and decide which ones are good and which ones are bad.]

I guess... wanting to protect people? Like, wanting to stop the darach, or the Alphas. Everything else is just...

It's about power. I mean, we're teenagers. High school sucks. We all wanna be stronger, faster... and we all wanna be part of something. You know? Part of the cool crowd. Part of something bigger.