You’re sitting on a jury trying to determine whether the def…

You’re sitting on a jury trying to determine whether the defendant is guilty of the crime he is accused of, which is kidnapping an adult for no ransom. You think “I can understand if someone abducted a child for a ransom, and he looks like someone who would do that, but I don’t see him as being guilty for kidnapping an adult and not demanding anything.” You catch yourself and realize that you are applying which heuristic that is leading to a bias?