" Does it have anything to do with the fact that the sentence above is interrogative or a rhetorical question? No, it is simply a different structure than the others you mention. Cannot/Couldn't help but do = must do/ had to do.
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AnonymousI don't remember reading or hearing something like "can help but do sth." Does it have anything to do with the fact that the sentence above is interrogative or a rhetorical question?No, it is simply a different structure than the others you mention.