Mussolini and Hitler signed agreements with the Church stating in part that the Church would be able to appoint its own bishops without State interference and teach its own religion in schools. These agreements are public record:
here is the full text of the agreement with Hitler.
Here is the agreement with Mussolini. You yourself can verify that there was nothing in those agreements that the Church should have had objections to.
The documents did not imply that the Church was okay with Hitler and Mussolini. The Church merely agreed to the documents allowing the Church to do its own thing free from State interference. Fr. Leslie Rumble cites evidence that the Church spoke up against Mussolini: On May 13th, 1929, Mussolini declared that the education of youth belonged to the State; and that, whilst then would be taught the Catholic religion, they must be moulded according to Fascist ideals with a sense of virility and power of conquest. Next day, May 14th, the Pope denounced Mussolini’s doctrine of State absolutism, his principle that children belonged to the State, and denied the right to instill aggressive nationalism and ideas of conquest. And he reminded Mussolini that the powers of the State are conferred upon it by those it governs. “Hence,” he said, “the State must use its powers on behalf of those who conferred them.” These words of the Pope show the wide gap between the democratic social principles of the Catholic Church, and the anti-democratic ideas of Fascism.
source
The encyclical
Mit Brennender Sorge condemned Nazi ideals in paragraph 8.
From all this data, we should draw two conclusions:
(1) Hitler and Mussolini at one point agreed to let the Church run itself in their countries, and the Church said that was a good thing.
(2) When Hitler and Mussolini did evil things, the Church condemned their actions.
I think that’s a very defensible history.