You have portrayed male polygamy as impregnating as many females as possible. I think, male polygamy is having multiple sexual relations. It is not impregnating multiple female.
Your concept of equalizing bad boys with alpha male is most likely wrong as well. If that were true, today's rapists would have been termed as alpha male.
The man in the following video is an alpha male according to your classification...
RE: Monogamy is an Evolutionary Strategy