Just watched Arrival and now reading reviews and discussions to comprehend the movie.
The aliens could see the future and know that they would need help from humans in 3000 years, that's why they have come to earth to offer humans a "tool".
They sure have seen Abbott die in this process before they came to earth as Louise see her daugher's journey with life from future. Neither of them chooses to change the course of the future.
As some review says they are creating the future by knowing it in advance, I kinda disagree. Though they have an option, none of them chooses to alter the future. That's not creating, thet's just observing the future.
Also Louise used the information from the future (the conversation with Shang) to change the immediate future, i.e a war with the aliens, then why not change their personal future?
Why didn't they use the tool/weapon to change the future so that it can be a non-zero sum game for everybody?