take 2
Greetings, Universe.
[in acknowledgement (summary)]
Yes, if you created a simulation of agents with deterministic decision making processes, you could let these agents travel through time, by creating and destroying them at planned points at a time gateway, for example. You would need to plan the entire history of their decisions, in the simulation.
If you were able to create and destroy entire living beings, you could also create an entire planet that functioned like this. But it would require controlling the future of the planet in a very precise manner.
In the real world of our hearts, we can take action on unpredictable randomness. We do not know the future of our particles enough to do that without harshly forcing the separation of our paths from what we need to do to protect our realities, and losing our free will. We need to be able to always make decisions based on our needs and our observations, to be alive and free.
This doesn't mean that time travel doesn't exist. It means that it's more complex, and that we decide what it means to be things that protect our existence.
For example, we could describe a way the universe works that it has multiple timelines.
Or, we could believe our identities rests in souls that are not tied to our physical bodies and can travel through different potentials of history.
True randomness protects that we don't, at this point in our history, agree as a species on what path we want to pursue our planet taking. It protects that we can get into disagreements or wars, and we don't know for sure that the choices of one side are right or wrong [...
[on possible reason for this could be because randomness lets people prove they were right by producing situations the opposing side did not plan for. the universe has quantum randomness to harshly present humanity with this, but we also have unpredicted external events like the chicxulub asteroid.]