Dayenu begins, If God had taken us out of Egypt but not inflicted judgement … This would have been a great miracle and it would have been sufficient, as is explained regarding the verse in the Torah, "Has any God ventured to go and take one nation out of another?" (Deut. 4:34) He took us out of Egypt as a person delivers a fetus from its mother's womb before its time. Israel was not yet worthy of leaving Egypt since they could have been judged as being no better than the Egyptians. These were idolaters, and these were idolaters. These partook of sexually illicit actions and these partook of sexually illicit actions. Even so God doubled our miracle by taking us out of Egypt and passing judgement on the Egyptians for subjugating us. How much more so should we praise the Master of Everything. God could not pass up the judgement of the Egyptians for He had promised Abraham, The nations which they served I will judge. (Gen. 15) Not only that but God passed judgement on all of them and not just some of them!