It would be a Luigi situation. People love Luigi, and 10/10, he would be found not guilty despite the fact that he’s obviously “guilty.” But again, because he killed a bad person, in most people’s heads it’s fine. So, in real life, Luigi would be found not guilty.

If Dexter Morgan were arrested, he would probably be found “not guilty” too because he only kills bad people, similar to Frank Castle.

People in real life don’t care about the law or what it says. Yeah, Luigi committed murder, but because he murdered a bad person, no one cares. Same with Dexter. Yeah, he’s a serial killer, but he kills bad people, so no one would care, and he would be found not guilty.