The Rebbe Reb Heschel as a very young child pointed to, what to him, was a most serious problem with the Chad Gadya. It begins with the father buying a goat for his son. The mean cat comes along and eats the goat. The cat is therefore wrong and deserving of punishment. Hence the dog who eats the cat is in the right. If so, the stick that hits the dog is in the wrong, for the dog was right.
Indeed in light of our thesis of this essay, this is the overwhelming message of Jewish history: that despite its moments when we truly cannot comprehend His ways, in the end the historical process will resolve our difficulty and our historic faith in G-d will be fully restored.( Rabbi Moshe Ch. Sosevsky)