went to a parochial Catholic grade school in the 1950s/60s. the nuns who were for the most part conservative but apolitical at the same time, were very upset when discussing it in history class. They felt that the allies should have found a way around Casino rather than reduce it to rubble. Of course the US spent whatever was needed to rebuild it.
in other news, in 1962 my 8th grade nun, told us that Kennedy could never(would never) sign a bill permitting abortion. as it was he never had that decision on his desk.
Destroying the abbey didn't help the allied cause. The Germans hadn't occupied it but afterwards used the rubble for good defensive positions.