Some people think that one is morally required to decry every evil, for, surely, intentions are prior to consequences. But that does not exclude an assessment of consequences when an intention is ordered. It is, in fact, unethical to decry an evil if one honestly holds that such an action will have more deleterious effects than those it seeks to prevent. Anyone conversant with the real situation in the Third Reich during the War will realise that the Pope did not have the power to halt the genocide perpetrated by Hitler. Even if not the case, it is defendable to suppose that Pius XII honestly believed that speaking out would expose even more victims to the fires of the death camps. Therefore, he did the right thing by keeping silent and trying to protect as many people as he could. This was the intention of a saint. Indeed, it is consonant with an intent to suffer for those being killed. Pius XII aimed to save lives, not to achieve public adulation.
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from the article: ADL urges Pope to suspend Pius sainthood over Holocaust inaction