Perhaps it is related to this concept:
“Sociobiology is based on the idea that some behaviors (both social and individual) are at least partly inherited and can be affected by natural selection. It starts with the idea that these behaviors have evolved over time, similar to the way that physical traits are thought to have evolved. Therefore, it predicts that animals will act in ways that have proven to be evolutionarily successful over time, which can among other things result in the formation of complex social processes that have proven to be conducive to evolutionary fitness.”

“The discipline seeks to explain behavior as a product of natural selection, thus behavior is seen as an effort to preserve one’s genes in the population. Inherent in sociobiological reasoning is the idea that certain genes or gene combinations that influence particular behavioral traits can be “passed down” from generation to generation.”

“For example, newly dominant male lions often will kill cubs in the pride that were not sired by them. This behavior is adaptive in evolutionary terms because killing the cubs eliminates competition for their own offspring and causes the nursing females to come into heat faster, thus allowing more of his genes to enter into the population. Sociobiologists would view this instinctual cub-killing behavior as being “passed down” through the genes of successfully reproducing male lions, whereas non-killing behavior may have “died out” as those lions were less successful in reproducing.”

“A genetic basis for instinctive behavioral traits among non-human species, such as in the above example, is commonly accepted among many biologists; however, attempting to use a genetic basis to explain complex behaviors in human societies has remained extremely controversial.”

It is just a theory and I am offering it for review, not necessarily endorsing this theory as it applies to humans. You decide.