If nothing else works, appeal to authority and claim the authority is the final word.
Ad Verecundiam.
Let's just cut straight to Orci's response to the same question you asked, YARN.
Lets, indeed.
BobOrci: Two reasons: The RED MATTER Device is destroyed, so even if he wanted to go back in time, he can’t. Secondly, our story is not based on the linear timeline of Einstein’s General Theory of relativity upon which most movies about time travel are based (like say, BACK TO THE FUTURE, or TERMINATOR, both of which I LOVE). The idea of a fixable timeline has been a wonderful staple of sci-fi since the 50’s, but in reading about the most current thinking in theoretical physics regarding time travel (Quantum Mechanics), we learned about the speculative theories that suggest that if time travel is possible, then the act of time travel itself creates a new universe that exists in PARALLEL to the one left by the time traveler.
Orci is not a physicist. He's miles from being a physicist. He's a sci-fi writer. He has no more authority on these matters than you or I.
Lets' note a few things.
1. Relativity theory has not been overturned. It is in fact one of the most accurate and reliable physical theories ever produced. Relativity theory and Quantum Theory do not mesh well, which is why physicists have been chasing a grand theory of everything for many decades now.
2. If you want to see what scientists have to say, many would tell you that
time-travel is impossible, full stop.
3. Speculative theories are just that, speculative. The Everrett/Wheeler "no-collapse" interpretation of quantum mechanics (which simply posits that the universe branches or splits every time a measurement like event occurs - which gives us a branching proliferation of universes) has been around for a half century. This isn't cutting edge speculation.
4.
What is possible in Star Trek has nothing to do with what is possible in the real world. There is no such thing as Red Matter or phasers or Romulans. This is the point that really matters.
This is the preferred theory these days because it resolves the GRANDFATHER PARADOX,
The time travel is impossible view (i.e., Einstein's personal view) also resolves causal paradoxes.
Orci, however, has also claimed that the prime universe is still real and that it is still there. He brought Spock from the old universe into the new universe.
He didn't do a hard reboot. Old and new are narratively connected. The old universe is not only real, but has overlapped with the new universe, and they are causally connected since events and agents from one universe have connected with the new universe.
You don't get to eat your cake and have it too. You don't get to do a soft reboot and use the ethos of Nimoy to confer legitimacy to the new regime, but then repudiate narrative facts that are part of that ethos.
To summarize above on the time travel issue, going back in time is the equivalent of stepping into a parallel universe, according to current speculations based on Quantum Mechanics. Starfleet and Spock, basing their decisions on this theory, would see that their is NO SUCH THING as “rectifying” the situation in a MULTIVERSE.
No, Old Spock would certainly know about sling-shotting and he would also know that it is closed-loop time travel. Seeing as how Old Spock had the secret formula for transwarp beaming, others would be inclined to respect his knowledge of the universe.
… and finally, my ace in the hole, a TEMPORAL PRIME DIRECTIVE.
I've already dealt with this one upthread. My analysis applies here too.
M'Sharak also pointed this out to you in a post. These were the rules Orci and Kurtzman operated by. In this universe, you can't do what you're asking for.
This has been dealt with upthread too.
If you don't like that answer, then you have to take it up with Orci and Kurtzman.
If I had wished to pose the question to them, I would have sent them an email. I didn't. I am, rather, asking the question of fellow Trekkies. If you don't have an answer besides that cut-and-paste, fine, stand aside then.