The true-crime genre focuses on the criminal - his thoughts, method, actions and ultimately his act; they pay little to no attention towards the victims, almost making them seem as props that reflect the criminal’s genius. For example, Ted Bundy is almost a household name on account of the various shows on his life and crimes, yet his victims’ names are scarcely remembered.
Another major red flag with crime films is that it may allow the viewers to empathize with the criminal. All actions have consequences, especially crimes. By empathizing, it in a way negates the purpose of depicting the crime