Some heroes are more against permanent justice than others, and while Luke Cage isn't a fan of taking lives, he isn't necessarily against vigilantes that do.
Luke Cage star Mike Colter joined up with Daredevil star Charlie Cox for a Facebook Live Q&A session, and amongst the myriad of topics they covered, they briefly spoke about Jon Bernthal's Punisher. Daredevil has his own thoughts on the character, as fans saw during season 2, but Colter was asked how Cage would react to the rough-edged hero, and if he would stop him if he happened to end up in Harlem (via Heroic Hollywood).
"No, I’m not gonna stop him. I don’t get blood on my hands but I won’t stop him from taking out dirtbags. I’d let it be. I don’t know if I have that thing in me that says I have to stop everyone from wiping out crime wherever it is… I wouldn’t care enough to stop someone else from doing it."
Harlem is Cage's city, but as long as Castle focuses his lethality on the criminal element, it doesn't seem Cage would have a problem. Cage is out to protect his city and save the innocents within it, and could really care less if those who would harm them get a second chance.
As for Bernthal, the actor just recently started production on his solo Punisher series, but no release date for the project has been announced. There are some who expect him to at least make an appearance in the upcoming Defenders series, but that hasn't been confirmed either.
Luke Cage is available now on Netflix.