God empowers evil people for a time, but only to accomplish His purposes. Then He takes away their power. For example, when Assyria’s king threatened to invade Jerusalem, Isaiah reassured King Hezekiah with these words.
“And the LORD has spoken this word against him: “The virgin daughter of Zion despises you and laughs at you. The daughter of Jerusalem shakes her head in derision as you flee. “Whom have you been defying and ridiculing? Against whom did you raise your voice? At whom did you look with such haughty eyes? It was the Holy One of Israel! By your messengers you have defied the Lord. You have said, ‘With my many chariots I have conquered the highest mountains– yes, the remotest peaks of Lebanon. I have cut down its tallest cedars and its finest cypress trees. I have reached its farthest corners and explored its deepest forests…
“But have you not heard? I decided this long ago. Long ago I planned it, and now I am making it happen. I planned for you to crush fortified cities into heaps of rubble. That is why their people have so little power and are so frightened and confused. They are as weak as grass, as easily trampled as tender green shoots. They are like grass sprouting on a housetop, scorched before it can grow lush and tall. “But I know you well– where you stay and when you come and go. I know the way you have raged against me. And because of your raging against me and your arrogance, which I have heard for myself, I will put my hook in your nose and my bit in your mouth. I will make you return by the same road on which you came.” (2Ki 19:21-28 NLT)