Warsaw was almost destroyed during WWII. It ended up getting rebuilt.
Hiroshima was nuked. It ended up becoming better.
Detroit was never nuked nor affected by war. Why is it still destroyed?
This is actually a kind of good joke.
Also, Polska did not really recover; by now it has, but it took until the 1970s for the lands that were II Rzeczpospolita to gain back to their populations they were in 1939. It's just that government will focus to rebuild the big and industry towns before doing other things + Stalinist follies were very bad there. Warszawa and Łódź and Minsk can get rebuilt from rubble and ashes, for sure, but the towns from Białystok and Turov were all killed.