Another explanation for why the nations are agitated is as follows: The verse in Isaiah 40:22 says, "He who sits above the circle of the earth." Why do the wicked resemble grasshoppers that are placed on a trellis to ascend, but then they fall? So too, the wicked fall. Rabbi Yehuda bar Nachmani said that after the generation of the Flood, it is written, "Now the whole earth had one language and the same words" (Genesis 11:1).
The later generations did not learn from the earlier ones, and Gog and Magog will come in the future and fall. David saw this and exclaimed, "Why are the nations in an uproar?" (Psalm 2:1). Another explanation is that the sea's waves rise and become stronger, as if it were engulfing the world, but when it reaches the shore, it flattens before the sand. Similarly, all those who join together to harm Israel fall before them.
This is why Israel rules like the sea, as it says, "The number of the children of Israel shall be as the sand of the sea" (Hosea 2:1). The nations, on the other hand, are ruled like the sea, as it says, "But the wicked are like the tossing sea, For it cannot be still, And its waters toss up mire and mud" (Isaiah 57:20). Nimrod and his comrades united against Abraham and fell before him, as it says, "And he divided himself against them by night" (Genesis 14:15).
Abimelech fell before Isaac, Esau before Jacob, Pharaoh and Egypt before Israel, and many others in the Torah. Even in the future, Gog and Magog are destined to fall before Israel, and David saw this and cried out, "Why are the nations in an uproar?" Rabbi Yitzchak said that even if one person asks another why they are doing something, the other person will get angry. However, the righteous ask God why things are happening, and they are not punished.
Why are they not punished? Because they did not seek their own benefit, but rather that of Israel. Rabbi Ibbo said that all the agitation of the wicked and all their toil is in vain, as it says, "The peoples have labored for what is futile" (Jeremiah 51:58). But Israel does not toil in vain, nor do they bring forth anxiety.