The short of it was that researchers created a paradise for mice where resources flowed freely, they didn't have to worry about predators, and they could live with absolute ease. At first their population exploded. Natural selection wasn't in play culling the less fit, so they started developing what they called 'spiteful mutations'. Males that were otherwise perfect specimens lost interest in sex and spent all day eating and grooming one another. Females became overly aggressive and either ate their own babies or threw them out of the nest too early. After a little less than two years, none of them were producing offspring, and after four years, every one of them had died off of old age.
The theory of how it affects humanity is that there are now so many people with spiteful mutations that they are pressuring the 'normies' into adopting their ideals, therefore causing a population decline in the west. One of the examples talked about in the first link was: “Spiteful mutations” undermine things like religion, which is little more than a way of promoting evolutionary imperatives. For example: go forth and multiply, cooperative with each other, repel the invader.
I've always wondered about this. When I first started participating in LJ communities in 2005, I was shocked at the amount of liberal vitriol toward certain issues. When the Duggars had their (15th, 16th, 17th?) child, the (mostly white) freetards acted like it was a personal affront to them. Of course, they wouldn't share the same amount of loathing toward welfare queens or Syrian refugees who popped out child after child, but make it a self-sufficient Christian family, and they go nuts.
The same pressure was seen in my own family. When my mom had her six and seventh children in her forties, her siblings with one or two children were whispering behind her back that she had no business having children at her age. The one drug-addled hippie said one of the rare sensible things she has ever said when she told them they really had no say in it. Then my mom's doctor had the nerve to lecture her about using birth control. My mom actually told him it was none of his business because she could afford children, and that did he give the same lecture to Medicaid recipients? My parents are the rare people who used to be atheists but decided to reject the empty, post modernistic bs dominating our society, cutting the cord and spending more time out of doors.
One thing I've always wondered about liberal women that I should ask Anon Conservative next time he posts about rabbity lack of child rearing urges. My mom used to tell me how never once in her childhood would Narcissistic Grandmother tell her she loved her, but she would dote over her little rat-dog like it was a child. What is it with cf people and their love for furbabies? -Like they think babies are gross because they poop in diapers and drool, yet they'll dote over something that will gulp down a pile of its own excrement, then lick their faces. Does it have to do with how much easier animals are to take care of?