First because Europe got the shit bombed out of it
It has little to do with that, actually. There are very few cities that got heavily hit. What was removed and remodelled in the 60s and 70s was way more than the war had damaged and it happened after the major repairs were already done. Even cities and countries the war never really touched got extensive remodelling.
It was a completely deliberate decision to remodel those cities, driven by modernist ideas.
It has little to do with that, actually. There are very few cities that got heavily hit. What was removed and remodelled in the 60s and 70s was way more than the war had damaged and it happened after the major repairs were already done. Even cities and countries the war never really touched got extensive remodelling.
It was a completely deliberate decision to remodel those cities, driven by modernist ideas.