You know the stories of criminals who have been arrested multiple times, convicted a few times, but are not jail? The reason is that for the most part guilty people, knowing they are guilty, will hide things. They will naturally avoid giving the police anything that can be construed to point to them being guilty.

An innocent person on the other hand, knowing they are innocent, will just talk. They will speak only looking at what they say in the best light. They will not realize that everything they say is going to be construed by the police to fit their theory of the crime. This is why it is important for an innocent person to think like a guilty person during their interactions with the police.