Nobody is ever going to really fully understand every dynamic of a person's experiences to ever understand why they act the way they do. We all have different memories, and from these memories and experiences, we choose to act presently accordingly. If someone is behaving in a manner that you dont understand or agree with, it isn't your duty to tell them that they are wrong on a consistent basis, because people are going to do what they really want to whether you agree with it or not.

You can stop a man from actually doing, but getting a person to stop thinking the way that they think, isn't up to you, and isn't something that you can change on your own. So don't expect people to understand you, and don't expect to understand everyone else. Just be sure to do what is right in your own heart.