They are the only ones that win in a war. For them it matters not who wins as long as they get the contracts and the money. Some day we will realize that it would be much cheaper to just write them a check and not do the war.
Let's try going badly for years. Yes, the military industrial complex was the winner in Afghanistan and other wars. Military contractors got rich and that alone was the plan. If we are surprised at how quickly the Taliban moved in try considering that they were already there. Afghans are tribal. The Taliban was among them the entire time. They are not a uniformed force moving and marching along. If you chose 1000 Afghans many of them would be Taliban. They never wanted our democracy and could not band together as long as we were there.
Surprised as to how quickly Taliban took control of the country and Kabul. Shows how much support they have in Afghanistan. Additionally we were not being told about the situation meaning that the war was going badly for many months and possibly years.