People against aid to Ukraine don't seem to understand that by spending billions now, we save trillions in the future.
If Ukraine falls, russia will go after more and more. They're genocidal expansionists, they think they're destined to rule the world, you just have to see any of their state TV shows. Poland knows this, and knows what happens to people conquered by russia, so Poland is arming themselves to the teeth.
If russia wins, they've plainly stated that they won't stop expanding westward.