There are two primary schools of thought regarding time travel.
Your ideas, and the theory used by most SciFi films is one.
Either Paradox is created, or a never ending infinite multi-verse keeps splitting off with each "change to the timeline"
Science Fiction prefers this theory because the stories are interesting and twisted what with all the Paradox and contradictions etc...
The Other theory isn't as interesting from a science Fiction writer's point of view. No paradoxes or multiple timestreams etc... to play around with. But while neither theory is proved or disproved, this alternate theory does have provable mathematical evidence to back it up.
A Single timeline. No Paradox.
Try reading up on Novikov's Self-Consistency Principle
Basically, the more likely an event is to cause a paradox, the less likely it is to happen. Even more basically stated, Paradox cannot happen, only events that are self consistent can happen. And there is (though beyond my abilities) mathematical evidence that this is true.
This theory is also in keeping with Occam's razor in being the simplest explanation rather than the infinitely complex perpetual multi-verse theory.
I have mentioned in in multiple other thread but I will try to restate it here in a more simplified form.
Take the shootdown of the two Japanese pilots.
People adhering to the same school of thought regarding time travel as yourself would think that by shooting down these two pilots, they would start a ripple of changes emanating out from the shootdown event, altering history as we already know it (Butterfly effect)
By getting shot down, these two pilots never take part in the raid the next day.
By not taking part in the raid, those sailors they would have killed survive.
By surviving, these US sailors go on to make even further changes as the events of the war now veer onto a different path than the one we knew.
Am I right so far?
WRONG.
This film is a rarity in Science Fiction films. It holds to the single timeline and Novikov's Self-consistency principle.
You can interact with the past, but only in ways that remain "self-consistent".
The Shootdown of the two Japanese remains self consistent with history.
In Real life... The Japanese did have Zeroes scouting ahead of the fleet.
In the films universe, a detailed examination of the Japanese records would have shown two Japanese Zeroes that were scouting failed to return. As there was no alarm raised by American forces, it was presumed the two Zeroes suffered a navigation error and ran out of fuel over the open ocean.
Only now, through the story of the film, we know that rather than running out of fuel trying to find their carriers again, they rant into the Americans and were shot down by the Tomcats. They never did participate in the attack, they always had been shot down by the Tomcats, it's only now that we know that. No History was "changed". No paradox, no butterfly effect.
It's an idea I only came up with after repeated explanations of this very idea on these boards, but the very idea of time paradox itself is fatally flawed.
It presumes (incorrectly) that an event happens one way, until a time traveler goes back and "changes" it to some other event thus altering history.
When a time traveler goes into the past and causes some event. It either happens AT THAT TIME in the past.... or it doesn't. If it doesn't, then there is nothing to alter, time goes on as it always had.
If it DOES happen at that Specific point in time in the past, then it always did happen at that point in time in the past and has always been a part of future histories from that point on, there would be no "previous" event to be altered from, thus there is no "change".
Novikov's self-consistency principle in action.
Thus to the Nimitz crew in 1979, those two missing Zeros had still been shot down in 1941 by Tomcats, even though it was not until next year (1980) that Nimitz goes back in time and does so. Because the events happened IN 1941. and had always been a part of the history from 1941 on to the present (1980). It's just we did not know bout it until they went back in time.
Further proof of this is the Tideman/Owens situation.
Tideman was not someone else UNTIL Owens got left behind in 1941 and then magically he was replaced with Owens as some sort of "alteration" to History.
Even in the beginning of the Film when Lasky goes to see Tideman in the Limo and the driver stopped him for seeing him, Tideman WAS Owens already, had ALWAYS been Owens. That is why Tideman would not allow Lasky to see him yet until after he came back from the trip. Tideman WAS Owens and knew what was to happen because he had already been through it as Owens 40 years earlier(to him personally) even though it was that very same day in 1980.
So back to your post. The problem is not the film. It is YOU trying to interpret the film using a theory that is NOT the correct theory used for this film.
This film follows a different theory and does remain perfectly consistent (pun intended)with that other theory.
The other problem on your part is your holding forth that other theory as if it is the only theory and that more so.. as though it was fact.
It isn't.
I joined the Navy to see the world, only to discover the world is 2/3 water!
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