The eyes of the Lord are toward the righteous and his ears toward their cry.  The face of the Lord is against those who do evil, to cut off the memory of them from the earth. (Ps 34.15-16)

The emphasis in these verses, indeed the emphasis in this whole psalm, is not on the righteous and those who do evil, but on Yahweh himself. There is one whose eyes are on the righteous and one whose face is set against evil-doers and they are one and the same person: our Lord.

Those who act rightly before God can rest in safety and security because they know that God is watching them, and whom God watches no one and no thing will gain ultimate victory over that person. Yahweh is their rock, refuge, stronghold, castle, and barricade.

Those who do evil can expect nothing but opposition and enmity from God. They cannot escape him, nor can they talk him out of his purpose to “cut off the memory of them from the earth.”

In both cases Yahweh is the active agent and deciding factor. God does not react to evil, he controls it for his own aims and to the end for which he allowed it. The righteous do not need to beg Yahweh to watch out and for them, because he has already promised to do so, and what he has promised he will do. This is great comfort to the righteous. To the evil-doer? Not so much.