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The_Duck comments on Causal Universes - Less Wrong
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I am having my doubts that time travel is even a coherent concept. Actually, I have my doubts about time itself. At non-relativistic speeds and over small distances we can kid ourselves that two events not in the same place can both happen "at" a particular time. But we know that in general that's only a convenient simplification. There's no objectively real "t" axis in spacetime independent of the observer's frame of reference.
But Eliezer gave you a constructive example in the post!
OK then, I am having doubts that my mind is coherent enough to discuss time travel usefully.
Understandable. Your brain shipped with a built-in module that models time as a property of reality in order to simplify other processes. Most people have to bludgeon it to near-death in order to just barely avoid the basic failure modes of thinking about time travel.
In fairness, his example assumed a universal timeframe (experienced by the simulators.)