He was involved in an "altercation" with some 17 year-olds. They probably called him out and Marcus isn't sharp enough to walk away. He's actually very soft-spoken. But he went from the projects to a mansion with no transition time. He'll keep screwing up until he gets jail time.
Your point about going from the projects to a mansion with no transition time is a very good point. I don't think that many people could handle that kind of situation very well.