Musar sur La Genèse 19:17

אל תבט אחריך . When G–d does a person a favor to which he is not entitled by personal merit, such a person should feel shame and embarrassment. He most certainly should not feel superior because G–d has chosen to do him such a favor. This is why the angels rushed Lot, as if to say: "Be happy that at least you save your life." On the other hand, when the Jewish people were liberated by G–d from Egypt, and G–d performed many miracles, they had indeed merited those. This is why the Torah says אשר עשה ה' אלוקיך במצרים לעיניך, the miracles G–d performed for you in Egypt in front of your very eyes" (Deut. 4,34). Not only were the Israelites saved from the effects of the plagues, but they were allowed to watch the Egyptians suffer from them.