Welfare programs promote the welfare of USA residents, which is a valid use of public funds. The defense budget is almost entirely wasted. We haven't won a war in 75 years. Our various bumbling military misadventures have killed thousands of Americans and millions of other humans. If we spent a tenth of what we spend, both we and humanity in general would be safer, happier, and more prosperous. The Pentagon is never held to account for its myriad failures, so over time it has evolved to do only one thing well: consume vast resources.