Generally speaking in modern states the right of violence is taken by the state. This is then imposed on the domestic body by policing and external polities by War. One could say this has been agreed by a social contract.
One could say that then a citizen has no right to resort to violence to enhance their reproductive success (I can't see anyone justifying violence in these terms - imagine being in court for murder and instructing your lawyer in these terms!). But a closer analysis shows that this resort to violence is given to the state as proxy. They are the guardian of violence. Since the state represents the body politic, everyones 'reproductive success' is enhanced.
There is a theory of Just War and Jihad that makes explicit the condition underwhich War is permissible. And of course the same goes for policing.