User blog comment:Thailog/Ep. 206 "Bloodlines" discussion/@comment-5145408-20120604165540/@comment-432124-20120606203712

Zod, that may be the way you think of time travel, but that's not how the writers of Young Justice are going about it. As Peter David specifically quotes, "if you change [the timeline] at some point, the ripple effect causes everything from that point on to change in order to accommodate the revision." That means that everything Bart did and is going to do should have changed the time stream all at once. Even Nathaniel said that when he found that only he had changed when Bart went back in time. This means that nothing that Bart plans to do from this point on while in the present is going to make much of a difference unless some other time traveler comes back from the future with the same goal in mind, but different methods.