The whole point is to harm Russia - a long time rival to the United States and a serious competitor in the arms industry and a major enabler of America's other enemies.The one thing that democrats and republicans agree on almost unilaterally is that we need to keep sending more money for the Ukrainian war effort. We’ve had some dumb wars in recent years(Iraq, Afghanistan, to name a couple) but the Ukrainian war is the dumbest, apparently Ukraine is our greatest ally? After maybe Israel
Afghanistan was a very dumb war - ungovernable , and not very natural resource rich. The Taliban goverement had little ability to harm the US or American interests. Iraq was a more successful campaign - Sadaam controlled a seriously oil rich nation and was not particularly amicable to Israel or the gulf states. Occupying Iraq was not such a successful move - but knocking out Sadaam was. However, if Sadaam was removed and US ground forces did not occupy the country - Iran's proxies may have taken over.
Libya was largely successful - a hostile goverment was destroyed at low cost to the US.
I am not supporting any of these actions - I am simply explaining the motives and outcomes from the point of view of America's elite.