Military members who support imperialism get promoted. Those who get to the top go on to work for war profiteers. The war profiteers fund think tanks which promote more wars. The mass media report "news" stories citing those think tanks. These stories manufacture consent for more wars.
The war industry reinforces itself. Those who get to the top of the war machine move on to the private sector and spend their time lobbying for more wars which create more eventual Pentagon officials who go on to lobby for more wars. Peace should be easy. This is why it's not.
Reading by Tim Foley.