Has anyone addressed the ethics of time travel?
Time travel looks like a gold mine for moral dilemmas, but I don't know of anyone who addresses these issues.
- Am I morally obligated to go back in time and change a tragedy that already happened?
- If so, how far back into the past is one obligated to "fix" things? Must we prevent the Black Plague? Do we stop the extinction of the Neanderthals?
- If the only possible way to stop a serial killer were to kill him while he was younger, would it be right (or even mandatory) to kill him while he is still innocent? If so, what about during his childhood?
- Is it okay to go back in time and preventing a child from being born? Is it any different from murder? Is it any different from birth control (or even not having children at the age of 13)?
- Do we prevent the Black Plague (from the earlier bullet) if it will cause many of the current people to never have been born?
- How would the ability to change the past affect punishment for crimes? If a crime can always be undone, how bad can it be?
I'm less interested in answers for these sample questions (although it would be interesting to hear various opinions) than I am in knowing if there is any serious material regarding the issue.