1.....(2.1)
Why do the heathen rage...
But the wicked are like the turbulent sea, for it cannot rest, and its waters cast up mud and dirt - (Isaiah - 57:20). Like the sea whose mire and dirt are upon its shore, so the foulness of the wicked is upon their lips. Thus Pharaoh asked, Who is the Lord that I should obey His voice to let Israel Go? (Shemot 5:2)
2.....(2.2)
Another word on - The wicked are like the turbulent sea (Isaiah - 57:20)...
As a wave rises out of the troubled sea and rears up as though the flood will cover the whole earth, yet falls flat on the sand when it reaches the shore, so whenever one heathen nation joins with another to harm the children of Israel, it will fall before them.
Nimrod fell before Abraham, Abimelech fell before Izchak, Esau and Laban, before Yakov, Pharaoh and Egypt, before the children of Israel, and the same is true of many others mentioned in Tanakh. And in the time to come Gog and Magog will fall before the children of Israel. Foreseeing their fall King David cryed out - Why do the heathen rage?
...peoples plot vain things...
The people labor for the fire, and the nations weary themselves for vanity (Habakkuk 2:13). But the children of Israel, They will not labor in vain or bring forth for trouble (Isaiah 65:23)