There are a lot of complex reasons but you can simplify all that stuff by examining the actors and their incentives. When you can print infinite dollars and shunt the consequences off on another party at another time there is no reason not to wage forever wars. Our task is to build an alternative system that fixes the incentives. We must be ready in time.

Society is going to break and everything will change. It could change for the better or for the worse. We must be ready in time.