You know, that is really not true. I have a blog about diabetes and the 86 million people in the US who are at present pre-diabetic which is very sad. In less than 3 years, it is possible that all 86 million of those people will be type 2 diabetic. I would go to any length which includes suggesting supplements that I have used to help deplete my need for any “prescription by big pharma”; they do nothing but prolong the diabetes because it can be cured with proper diet, exercise, and rest. All of these things can be enhanced ten fold by using supplements that I have suggested. These suggestions do not come from a flip of the switch either. Thanks for listening. I understand your theory but not all of us are “big pharma salaried”.
Testosterone is significantly correlated with aggression and competitive behaviour and is directly facilitated by the latter. There are two theories on the role of testosterone in aggression and competition.  The first one is the challenge hypothesis which states that testosterone would increase during puberty thus facilitating reproductive and competitive behaviour which would include aggression.  Thus it is the challenge of competition among males of the species that facilitates aggression and violence.  Studies conducted have found direct correlation between testosterone and dominance especially among the most violent criminals in prison who had the highest testosterone levels.  The same research also found fathers (those outside competitive environments) had the lowest testosterone levels compared to other males.