Psalm 12 reminds me of a friend of mine who believes the world was better when he was young. The complaint that “no one is faithful anymore”(v.1) is an ancient one and a modern one. This is why the Psalms remain relevant; they discuss immortal themes and immortal truths. It is true that at times the world seems like a dark and unforgiving place; this was as true in ancient Israel and is today. The truth of God's goodness is unchanged too. God still arises to protect the needy.
Pray today that God would act to protect the poor and needy. Be ready to be used by him.