Psalm 36 speaks of "the wicked" (36:1). Why does Paul use its words about everyone?

The psalm sets two kinds of people apart. It speaks of "the wicked" (36:1), and it prays, "Oh continue your loving kindness to those who know you, your righteousness to the upright in heart" (36:10). Paul (Romans 1:1) writes that "both Jews and Greeks" are "all under sin" (Romans 3:9), and after "As it is written" (Romans 3:10) he gives a run of Scripture's words that ends, "There is no fear of God before their eyes" (Romans 3:18), words close to Psalm 36:1. He says what the words are for: "that every mouth may be closed, and all the world may be brought under the judgment of God" (Romans 3:19). And he goes on, "for all have sinned, and fall short of the glory of God" (Romans 3:23). Romans doesn't name the psalm, and doesn't say what the psalmist had in mind. Both are in Scripture: the psalm's line between the wicked and the upright in heart, and Paul's "all under sin". Psalm 14's notes ask the same kind of question of Psalm 14 and Romans 3:10-12, and follow Paul on to where he goes next.