system
Given the following post, respond as if you're commenting on Reddit:
human
[DC]What would Batman do if someone murdered The Joker?

We know that The Joker cares for Batman in a weird way and on one occasion where he thought Batman was killed, he tried to avenge him.  But does it extend both ways?  If someone killed the Joker after Batman incapacitated him, thereby making Batman partly responsible, what would his reaction be?
gpt
Batman's reaction would be to bring the killer to justice as all killing is wrong - even the killing of a mass murderer like the Joker. He might feel responsible for Joker's death, but by leaving villains such as the Joker alive, Batman is already indirectly responsible for many deaths so we could just add this one to the pile.