This boils down to a "Might makes right" claim. It doesn't answer the question why. Only how.
It definitely answers why. You are asking for an appeal to some moral justification. But there isn't one, and it doesn't matter. That's the whole point of "might makes right".
What question do you want answered exactly? Why we have governments and not anarchy?
It definitely answers why. You are asking for an appeal to some moral justification. But there isn't one, and it doesn't matter. That's the whole point of "might makes right".