Noir cliches

Rewatched some of the Spawn animated series last night. Does TV Tropes have a name for the serial-killer-with-family-connections? because I’ve noticed that premise in a lot of shows (usually it leaves me wondering why a politician with the ability to have crime scenes scrubbed/cops bought off/honest cops killed doesn’t just have his murderous relative put under lock and key, or at least followed by people with orders to prevent him from indulging his hobby.)