It is not gender. Gender is a social construct. I think that you meant sex.
Yes, both sexes have different hormonal physiology that is predetermined by genetics (it is mentioned in the article).
Intensity of aggressive behaviour is largely conditioned by the environment. Certain cultures are more aggressive than others (some not at all) due to many environmental factors such as value system, tradition, scarcity of resources, state of healthcare, economic class, psychologically unsustainable upbringing/childcare, etc.
Once you understand, root causes of aggressive behaviour within social environment, and how to eradicate them, you can design society that is almost completely void of aggressive behaviour (almost because there some genetically determined cognitive disorders that are random and not shaped by environment).