Question

A truly rich man, an immensely wealthy magnate, announced that he has a practical plan to settle a million people on Mars and provide for all their needs, by developing rockets and spacecraft that can be reused, along with various other cost-saving measures compared to governments and their clumsy, outrageously expensive programs.
And so, roughly once every decade there are 26 months when Mars is close to us and we are close to it, and in each such period a thousand flights will be sent, with 100 people on each flight, for a total of 100,000 in every period when it is close to us. We would reach a million within a few decades at a not-crazy cost, and the figure of a million people is calculated to include everything they need.
That is, a million selected people from humanity could produce and sustain themselves there without any dependence at all on those left on Earth, and all this would create a complete backup for humanity.
If meteors strike us, earthquakes, tsunamis, pandemics, wars, destruction of nature, plastic, nuclear weapons, or any other disaster we do not know how to foresee—there would be someone to continue us. A kind of backup.
That, in short, is his plan.
My question: according to what Maimonides wrote in the Guide, and also according to what science reveals, almost all threats are either man-made or natural harms that humanity, if it grows wise, will know how to prevent. [Even meteors that could wipe out the universe—I understand that advanced experiments already make it possible to divert them from a collision course.] And certainly wars and nuclear weapons, or pandemics = get vaccinated, etc., and of course plastic and the like. So the overwhelming majority of the problems are in human hands.
And who will guarantee that our “backup” won’t go up there and split into nations and ethnic groups and develop nuclear weapons and destroy the environment exactly as we have done on planet Earth?
Therefore, seemingly, it would be preferable for him to invest, just as he would invest trillions in programs to make Mars accessible, in people of thought—philosophy, ethics, religion, morality—and perhaps even to try to establish a school for prophecy, etc., so that the human backup will behave better than we do, and thus the backup will have a much higher chance of surviving and continuing humanity.
And then the reasoning comes back around: if the plan has been found for man’s moral and value-based existence, which makes the physical existence of the world possible, then why is there any need to go up there at all?
With the resources and plan that would make it possible to build a world ethically repaired, let us do it here on planet Earth and survive for all time, “as the days of heaven upon the earth”?
What does the Rabbi think about this?