The angel said to them, "Don't be afraid, for behold, I bring you good news of great joy which will be to all the people.
To all people ...  The good news announced by the angels was not merely for Israel, but for Gentiles and all men.  It is not correct to view the universalism of Luke's Gospel as being due to any conscious choice on his part, selecting only the material that would convey this; because in this very episode we have Luke the Gentile recording the first announcement of Jesus' birth, not to Gentiles, but to Jewish shepherds.  On the other hand, Matthew the Jew, and scholarly expert in the Old Testament Scriptures, introduced the Gentile wisemen as first learning of the Saviour's birth through the message conveyed by the star  (Matthew 2:1,3).  Wonderful are the ways of the Lord.