Each culture. Each people. Each nation must have a place to call home. A place to govern themselves as they see fit.
These "homes" must be homogeneous. Mixing of the cultures, the races, result in terrible consequences. The mixing of the races will result in the extinction of all but one.
It will be the race that multiplies the fastest. The most aggressive. The most murderous.
That last surviving race will then consume itself. Leaving mankind as but a footnote in the cosmic history of failed civilizations.
It will not be the most intelligent or the most productive.
All of nature screams this simple truth.
If you wish to survive as a race, as a culture, you must become as murderous, as aggressive as the most based animalistic behavior of the humanzees walking the Earth.
And if we set up such a planet. A place where each culture and race could govern themselves, does not the problem persist?
Will one or more attempt to take more from those not of their "country?"
Are we not here now? As we have always been?
One alternative remains. To remove from the planet, everyone not of our own race or species. Then we would be safe?
No !!!!!
Then we would divide by blue eyes or brown. By left handed or right. By blond hair or black hair. By long dicks and short dicks. We humans must overcome this issue to survive much longer.