Besides whales being much stronger/tougher than a shark can reasonably face without risking being killed, most cetaceans are social animals and tend to travel in pods. If a predator tried to take a bite out of a whale calf, the entire pod would be on it before it could process the taste. Imagine Maximum Overdrive by Stephen King, where cars and trucks are actively chasing and killing people, and you can get a good comparison of how screwed a predator antagonizing a pod would be.
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