Why? It’s how the mammal world works since the beginning of time. Females seek out the alpha male.
The "alpha male" is not even how wolf packs work in the wild: https://www.scientificamerican.com/article/is-the-alpha-wolf...
The researchers who coined the phrase eventually realized it only applied to artificial packs in captivity, not the wild.
Mammal world has also worked by killing another mammal with food you want if slightly hungry. Yet, for some reason, people don't question why murder is illegal whenever someone gets convicted of homicide. Selective appeals to evolutionary history are an empty argument.
"Is-Ought Fallacy" is the right search term.