Cruel or just teens????

So today was a half day, crazy as usual, but mostly boring. I mean this day was SO boring, I'm gonna have to show you pictures of us, either sleeping or bored out of our minds, just so I can emphasize how boring it was...




So that proves today was insanely boring!!!

Something happened on the bus that just totally got me thinking; Why are teenagers so rude and cruel??? They don't have to be, but why are they?
So, on the bus there was this one little sixth grader that "everyone" hates, and one of the eighth graders punched this kid in the face (the kids head hit the window) and he knocked out. All the other kids just left him there; He missed his stop, and four others. When he woke up it was the last stop (mine) and he had to get off and walk all the way home!!! My question is now, why do teens act cruel toward others, is it programmed in our heads??? Or maybe fed to us in our lunch food??? And here's an even better question; Does it get better as an adult or is it the same and they just know how to hide it better???