Greater population, increased competition for fewer resources/jobs, more stress about the future/less hope, more people living in dense/anonymous cities, more m

Greater population, increased competition for fewer resources/jobs, more stress about the future/less hope, more people living in dense/anonymous cities, more mobility, more distractions, less community, less IRL communication and socialization in general, worse social skills, overworked parents didn't teach them how to interact with others properly, extended adolescence, and more Hikikomori. People don't have sex when they're depressed, overweight, never go outside, and play video games all day.