The future is unwritten and therefore entirely down to us, fate and predestination are nonsense because they can only be measured after the fact, we look back at WWII and say, well, that was inevitable, but there was probably a point in the 1920s when it wasn’t. 
It is entirely possible that the reason we have no firm proof of extraterrestrials visiting us is that there is a natural tendency for species to evolve to the point where they are capable of destroying themselves – which is about where we are now – and then to do so. In other words, perhaps most species self-destruct before they make it out into space and start discovering other planets.
Still, a tendency is not 100% and it is easily within the realm of imaginability, i.e. not proscribed by the physical laws of the universe, for a species to continue to exist, and evolve, beyond that point. I propose we set that as our goal: continued existence.
The way to do that is to put our smartest people to work figuring out a way to sustain our environment, prevent disastrous meteor strikes, come up with an emergency plan to survive (or prevent) supervolcanoes, earthquakes that measure 9+ on the Richter scale, and megatsunamis, save the honeybees, end eliminate poverty by giving everybody homes, sending all the children to excellent, high tech, modern schools which have an adequate number of teachers, build high speed trains that go around the world, and begin the colonization of space.
Then, once they’ve done so, to listen to them and implement the plan.
Will that eliminate war? I believe it will. Not because people will suddenly become nicer, less bloodthirsty, or less desirous of holding on to their pathetic, little piece of land which they believe, in their tiny little minds, is theirs by divine right, but once people are comfortable, well fed, and have a good chance of living into a comfortable and healthy old age, they are a lot less likely to want to risk their lives, even to kill people they really hate.
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