You don't have to get a job that makes others feel comfortable about what they perceive as your success. You don't have to explain what your plan to do with your life. You don't have to justify your education by demonstrating its financial rewards. You don't have to maintain an impeccable credit score. Anyone who expects you to do any of those things has no sense of history of economics or science or the arts.
When civilians are not asked to pay any price, it's easy to be at war - not just to intervene in a foreign land in the first place, but to keep on fighting there. The justifications for staying at war don't have to be particularly rational or cogently argued when so few Americans are making the sacrifice that it takes to stay.