It was bombed for, given the data they had, good reasons (it turned out the intelligence data was not correct, but not the decision process).
It was also relatively untouched compared to what Third Reich planned to Warsaw even before war, yet alone the revenge spree in 1945.
There are reasons why it's practically illegal to remove most bullet holes you find on some walls on western side of Warsaw - they are the rare walls that survived.
Err, Dresden was infamously firebombed to hell in the final days of the war (for no good reason).
https://en.wikipedia.org/wiki/Bombing_of_Dresden