I get the sense of a religious fanatic trying to send a message to mainstream worshipers, kind of like a modern day Martin Luther, but instead of nailing his complaints to the church doors, he's using spray paint, "tagging for the Lord," you might say. The music matches so well the sense that the narrator feels that he really has found the answer to things the rest of us don't understand, and that he has a duty (and desperate need) to share it with us.
I get the sense of a religious fanatic trying to send a message to mainstream worshipers, kind of like a modern day Martin Luther, but instead of nailing his complaints to the church doors, he's using spray paint, "tagging for the Lord," you might say. The music matches so well the sense that the narrator feels that he really has found the answer to things the rest of us don't understand, and that he has a duty (and desperate need) to share it with us.