system
Given the following post, respond as if you're commenting on Reddit:
human
[Timetravel] So I "accidentally" erased someone from the timestream...

So I'm a run of the mill timetraveler that messed up and lost my love interest to my best friend. They got married and had a baby while I was in a 15 year coma.

Lets say I traveled back again and by some off chance made sure they didn't meet. Would I be held liable for murder? And what if I hypothetically went overboard and "accidentally" all my girlfriend's love interest, would I be held accountable for all those lives if they and their descendants didn't exist in the present?

Is there any way I can protect myself legally from the consequences like pledge insanity or something? Of course that's only hypothetical, not like I'm a time travel murderer or anything, hahahahaha \*nervous chuckle\*
gpt
If there's a single timeline, what you're suggesting is impossible. The closest you can come to that is going back in time and fooling your past self into thinking he lost his love interest to his best friend. That being said, you should go back in time anyway. If you only go back if you don't lose your girlfriend you risk causing an ontological paradox where you don't go back because you don't go back. There's nothing dangerous about these, but it does mean you're likely to lose your girlfriend. At this point you already know that your attempt will fail, but it's important that you're willing to do it anyway.

If there's multiple timelines, you're not erasing them. You're just creating a new timeline without them. This is no more a crime than failing to create someone in the first place. Go right ahead.

There is a third form of time travel where you basically end the universe and reset from a certain amount of time before. You are killing all the people currently alive, but you're also adding extra time to the otherwise finite length of the universe. Basically, every day you go back in time is an extra day before the heat death of the universe. If you think death isn't intrinsically bad and is only a problem because you could have lived longer, then there's no reason not to time travel. If time travel is legal at all, then this would probably be fine.