It's to do with a lack of reason for men to do anything.
Why work your ass off for 40-60 hours a week in order to better your country when a homeless, drug-addicted chad can make women be more in love with him simply due to having the right height and bone structure?
Women are just not compatible with building a society, we are seeing a trend of them picking the most dominant 'alphas' - literally just look at any fucking female romance novel, look at the statistics. The problem is that these 'alphas' are aggressive, dominant and attractive, and yet not much else. They're not intelligent or resourceful, or even charitable. Single motherhood is exploding due to this, they thinks these 'chads' will suddenly stop being violent and self-interested after their child is born, but they receive a rude awakening.
When the bulk of the working male population starts to feel that there's nothing worth working for; there's no way for them to build a family, fall in love, own a house etc. etc. Then society collapses, because these men don't care anymore. Why would they want to build a society that they're not included in? What other motivators are there but crude consumerism? Society becomes godless and motivation-less.