Instrumental or cognitive aggression: these terms are interchangeable, both meaning the aggression is planned and is used as a means to meet a goal that can't be achieved in any other way.
Instrumental aggression is a planned attack and is typically the one means left. It is seen as necessary as no other plan has worked to achieve the goal. It is thought out and even justified by a higher moral grounds.
The following classes were common in early civilizations:
Rulers, Priests, Merchants, Farmers, Artisans, and Slaves
Yes because they all tried to solve issues with war, economics, and society. The "New Deal" from FDR, the "New Frontier" by JFK, and the "Great Society" by LBJ.