You’re debating two things: whether the US should intervene in Ukraine, and whether the US should get its internal affairs in order.
Your points are that war is expensive*, the US has a poor ability to run its internal systems (yes and no, but how does this imply we should sit on our hands with foreign policy), this war isn’t useful.
*The monetary cost of this war (to the US) is just not a legitimate part of the debate. It’s pittance what we’ve supplied.