system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Would Batman, given the opportunity, save his parents' lives, knowing that doing so would prevent him from becoming Batman?

Assume that doing so would spawn a new timeline, not create a paradox. However, Batman as he is would cease to exist after that fork. Batman also knows all this beforehand. (Obviously).
gpt
From a comics standpoint, it's been shown that if he were presented with the opportunity to choose impulsively, like if you basically just dropped him off in the past, his first reflex would certainly be to stop it, without considering the long term implications.

There's a very famous Bronze Age tale called "To Kill a Legend" where Phantom Stranger offers Batman the chance to stop his parents from being murdered in a parallel Earth, which he accepts.

Batman and Robin arrive in a world that's virtually identical to theirs except it's 20 years behind the main world.

As soon as they arrive Bruce makes plans to look for Joe Chill and stop him, while Dick is more hesitant and decides to investigate this dimension, so he can see what the potential fallout of creating a world with no Batman is.

Dick finds out that this earth has absolutely no superheroic/superpowered presence at all, so if there's no Batman, there likely wouldn't be a single superhero around to pick up the slack, which makes Batman even more important to this world.

Anyways, Dick goes out to intercept Bruce at crime alley, going back and fourth between whether he should stop Batman from stopping this Wayne murder or not, saying that the results would be tragic in either case. At the end his nature as a superhero wins out and he summarizes that, destiny be damned, they can't willingly allow people to be murdered no matter the possible consequences/benefits. 

Before Dick can reach the Waynes though, he sees that Batman already made his choice and witness him knocking out Joe Chill and saving all three Waynes.

The Phantom Stranger whisks them back to their world, without informing them of what happens to Bruce in the alt-timeline.

An epilogue reveals though that the alt-Bruce will still becomes Batman anyways, even with his living parents. Only instead of being inspired by tragedy, he's inspired to greatness by witnessing and being saved by Batman-Prime's heroism.