Like workers do not have common "class" interests, capitalists do not have common "class" interests, other generalization may be misleading too. While some politicians do have personal investments in oil business, others persue their own interests. Wars provide gainful employment for millions of Americans. Each has its own interest to prolong a war or nations building.
For example, CIA agents who cary cash to warlords and trade unions at Lockheed Martin just LOVE it. A war machine can simply put a politician's relative on a payroll via some subcontractor to assure political support.
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