system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Someone is going back in time to stop Thomas and Martha Wayne from being murdered. This means Batman will never exist. Does Bruce follow him back in time and stop him so that his parents can die?

It boils down to this:

1. Batman can either let this person go back in time and save his parents from dying, resulting in Batman never existing.

2. Or he can follow him back and stop him, but would have to watch his parents die, or at the very least listen to the gunshots and screaming all over again.

What does he do?
gpt
I forget where exactly, but there was a story once of Batman himself going back in time and stopping his parents' murder.  The resulting heroics inspired a young Bruce Wayne to become Batman, albeit lighter and healthier about it.  

There will always be a Batman.