Or HaChaim on Exodus 18:11/אור החיים על שמות י״ח:י״א

1 עתה ידעתי כי גדול ה׳ מכל האלוקים, "Now I know that the Lord is greater than all gods;" Yitro acknowledged that although all other nations have spiritual representatives in the celestial regions, some of whom are very powerful and both protect their protegees and assist them in their wars, they do not exact retribution from the adversaries of their protegees as does G'd. Only G'd operates on the principle of the punishment fitting the crime. Only the G'd of Israel would drown people who themselves had drowned others, etc. When the celestial representatives of other nations act in defense of their protegees one cannot recognise this as what happens to their adversaries seems totally unrelated to what these people had perpetrated. In the case of the G'd of Israel, every one of the plagues He brought upon Egypt was retribution for a specific wrong committed by that people and their king.