Robotics will helps us eliminate a lot of that. I think it happens because you can't get the output you want in a different way. You say the three sources of power are wealth, violence and knowledge. There's no doubt about the power of sex as a driving instinct in the human species. But I would say sex is a goal.
Power comes from the ability to withhold something that someone else wants.
The environment about which we make choices is much more complex and fast-changing and diverse. And I think that you have people going through multiple or sequential identities. Joggers were an invention of the '60s. Now taking care of your health, being physically fit, is a value. That never used to be a value.