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.
Attila the Mongoloid terror of the steppes got some bad press, but his wives still called him Hun.