Answer:
I would consider Greasers' and Socs' actions to be herd behavior. For example, Ponyboy didn't have to become a Greaser, but he hung out with them, and his brothers were Greasers. Another example is if one of the Socs gets super drunk and beats up on someone, the rest would join in. The don't want to feel left out, they want to be what people expect sometimes. But not all of them, and not always.
Explanation:
