So, imagine you're playing a game of pretend with some friends. One person decides that they want to pretend to be really good at something, like drawing or dancing. But, instead of those normal things, they want to pretend to be really good at something that's really bad in real life, like murder.
They talk about how they would do it perfectly, without getting caught, and how fascinating it is. They might even make up stories about famous killers from history and what made them so good at what they did.
But, in real life, murder is not a game. It's a terrible thing that hurts people and families. So, while we can pretend to be interested in it in a game or a story, we should never forget that it's a real and serious issue.