Teenagers are cruel primarily due to the hormones influencing their behavior, and the lack of mental capabilities to cope with it. That, and kids these days aren't taught any moral values, how to behave, and will do anything to gain approval from their peers.
Basically, very few human beings have the capabilities to act properly when they're teenagers. After all, adolescents are the most cruel humans alive, and have been for as long as humanity has existed.
I've seen the scale of just how intense the emotions brought on by hormonal changes can be.
These same kids that conduct cruel acts like bullying disabled people are also sometimes the ones that cry themselves to sleep at night, although their surroundings aren't the cause, nor are the events going on in their lives.
They might think that's the case, but it's actually hormonal changes and the fact that they don't know how to deal with it. The hormones warp their minds farther than you probably think.
Now, I can explain why today's teenagers are more cruel than any other past generation outside the chemistry aspect, but the post would be a bit too long to read if I did, so just tell me if you want to know so I can make a separate post or VM you (also to avoid getting off topic).
But you get the idea now, right? Most modern teenagers are stupid, hormone-driven animals that don't have the ability to understand even the most simplistic concepts. And we can thank their parents for allowing them to worsen.
