In GW1, GW2, Afghanistan, Iraq occupation, etc. I think there was some public and perhaps even servicepeople confusion as to what the fight was for. For what purpose, for example did over 7,000 U.S. troops die in Afghanistan's invasion and subsequent occupation? How is the USA, its NATO allies or Afghanistan better off today?
But Ukraine's war is in my lifetime the first "good war" where Western values and people are helping an ally to fight an evil, clearly discernable enemy whose defeat is both definable and achievable. And whose defeat will make the West stronger, more united and bring Ukraine firmly out of ex-Soviet corruption and into the light of the West. When this war is over Ukraine will be a leading economic power in Europe and as a NATO member able to do more than its share to stand up to Russia. That's why I support helping Ukraine to the bitter end, because it's achievable and hopefully good for the world order (a total geopolitical collapse of Russia and subsequent power vacuum may not be, so let's no ask for that).