The military industrial complex has become too big to fail, because it is jobs provider for many places that don't have much resources. It's not a coincidence that many defense contractors are headquartered in peripheral regions like the American South West desert and Scotland. These places don't have much to offer in terms of resources so they became dependent on the industry. Either that, or they become tax haven like other small entities like Ireland, Luxembourg and Seychelles.

I'm not trying to justify the existence of MICs by the way, I'm explaining why the industry became intertwined. Although, I believe there is just war if a country is either provoked or to stop atrocities, such as the NATO intervention in Yugslav wars and supporting Ukraine against the Russian invasion.