If the LORD "gives food to the hungry" and "frees the prisoners" (146:7), why are people still hungry and in prison?

The psalm says what the LORD does, and doesn't say when or how: he is the one "who executes justice for the oppressed; who gives food to the hungry. The LORD frees the prisoners" (146:7). It names no one he has fed or freed, and it sets no time. It puts the list between "who keeps truth forever" (146:6) and "The LORD will reign forever" (146:10). In Deuteronomy the same kind of words about the LORD are followed at once by a command to his people: "He executes justice for the fatherless and widow and loves the foreigner in giving him food and clothing" (Deuteronomy 10:18), then "Therefore love the foreigner, for you were foreigners in the land of Egypt" (Deuteronomy 10:19). Psalm 146 itself gives no command there; it praises. These notes don't claim more for the list than the psalm does.