Once, a very controversial Talmid Chochom was sick, and the Bachurim asked R' Ahron Kotler Zatzal if they should say Tehillim for him. R' Ahron was on fire about this. How could they ask him such a question? Of course! And this person was radically different from everything R' Ahron stood for.
When Heinrich Himmler agreed to save a few thousand Yidden for money, R' Ahron went to a Jewish agency. Although the Satmar Rebbe and R' Yonasan Shteif Zatzal were among those people, still the agency wondered why R' Ahron went out of his way for the rest of those Yidden. “They are mostly neologs (the antireligious of Klal Yisroel), who are totally against you”. R' Ahron became very upset. “Aren’t their mothers Yidden?” “How dare I not save them?”