When we were kids, we often did things just to feel like we were a part of something. We wanted to be accepted by a certain group of people. We did things that we normally wouldn't do if we were by ourselves. However, with time and experience, we hope to grow out of that mode. But, like anything else, there are exceptions.
Being in detention, I've witnessed so many young adults who are still plagued by peer pressure. They have no respect for themselves. Therefore, they have no respect for others. When there's only one or two of these people, they're quiet as mice. As soon as there are three or four of them, they become a pack of hyenas.
I'm amazed and saddened to see so many people who have no respect for themselves.