John Calvin remarks on the rage of the nations and the response of Yahweh in Psalm 2:4.

[W]hen God permits the reign of his Son to be troubled, he does not cease from interfering because he is employed elsewhere, or unable to afford assistance, or because he is neglectful of the honour of his Son; but he purposely delays the inflictions of his wrath to the proper time, namely, until he has exposed their infatuated rage to general derision.

—Commentary on the Book of Psalms

In other words, God has presidents and prime ministers right where He wants them to show off their ridiculous foolishness.