I guess you would have to adjust for other factors and compare within those nations. I am not claiming it is the only or even dominant factor. https://www.scie

I guess you would have to adjust for other factors and compare within those nations. I am not claiming it is the only or even dominant factor. https://www.science.org/content/article/fatherhood-decreases-testosterone https://www.science.org/content/article/fatherhood-decreases... I think testosterone might have a big margin effect in unstable individuals.