It means that even it everyone is doing something wrong, it is not right. It is referring to peer pressure, don't do something just because everyone else it doing it.
Answer:
At the drive-in, Dally harassed Cherry and Marcia and was quite rude. On the other hand, Ponyboy was nice to the girls, and they had a friendly conversation about Soda. Although Johnny was shy and didn't talk, he was the only one who stood up to Dally for the girls when he continued to harass them.
Explanation:
It helps you figure out what you want to investigate and how.
