Humpback whales do regularly intervene to protect other marine animals from orca attacks — a behavior marine biologists have documented over decades, including attacks on seal pups, dolphins, and whale calves. The behavior is real and unusual enough to be noteworthy, though framing it as 'kindest thing in nature' reflects the post's emotional interpretation rather than scientific consensus. Search results confirm humpback intervention behavior exists and is recognized by researchers, particularly around South Africa and other regions where orca hunting is active.