can't see the exhausted and skint Ukrainians decide that (...) it's time to invade their richer neighbors
Ukraine will never again be a threat to Poland
It's remarkable how little understanding you have of war and of life in general.
But even with your woefully underdeveloped imagination, you must surely be able to conceive of radical nationalist turn in Ukraine, or a powerful post-war Ukrainian army coupled with nationalists' revisionist ambitions, or a collapse of the European security order (you don't have to use too much imagination for this one), or state collapse and spillover instability (weapons trafficking, organized crime, cross-border violence etc.), or Ukraine losing lands in the West and the fringe elements who dream of "Zakerzonia" rising to power and seek compensation in the west, or future Ukraine emerging as heavily militarized, dominated by veterans and politically authoritarian - such Ukraine can easily ally itself to AfD ruled Germany.
So, there is a hundred-and-one ways in which Ukraine can be a threat to Poland, you perfect retards, and we have to take them all into account. That's what strategists are for, and we are all strategists here, aren't we? (albeit slightly amateur).
EDIT:@Bobko - thank you. You see what kind of retards I have to deal with here.
*sighs*