Board Thread:General Discussion/@comment-74.104.206.83-20130730235710/@comment-22580009-20130925205902

One theory of time travel is that killing yourself would create a paradox. You only killed yourself cuz future you said to, but if you die, future you doesn't exist to tell you, so you don't kill yourself. it creates a loop. Or you could say that because they travelled back in time, then future you no longer exists in the timeline, therefore will not be destroyed.