Just have to look at life success statistics for fatherless children versus those raised in the house with their father. They fill the prisons, the brothels, the psychiatric clinics and detox centers.

You can see the damage right in their DNA:
"Kids who were raised without a dad have much shorter telomeres, the protective caps at the ends of chromosomes that are believed to affect health and longevity"

https://www.christianpost.com/news/fatherlessness-shows-up-in-childrens-dna-affects-lifespan-study.html