Because "harems" don't form good families.
Genghis Khan had a harem, and the kids all turned out ok.
All right, some of them were megalomaniac mass murderers, but then look at dad, and that WAS the family business.
And there is the definition of “good”. If “good” is an objective metric, if it means passing on ones genes, then GK was the best - 0.5% of the worlds male population, 20 million men, have him as an ancestor, which is a sobering thought.
Musk may define “good” the Genghis Khan way, which is valid if ruthless.
As long as the women and children are being supported I don’t care how Elon has his kids!! Elon has a form of Asperger’s probably not the best candidate for husband material!! He loves his kids and financially more than cares for them and their moms!!