You can boil down the entire message of Scripture to: God loves us.
Israel had idols and God didn't have a place of prominence in their lives, so God took them from their own land and into exile to remind them that God loved them. Why? Because our good God will ruin you for your own good and for His glory.
Galatians 3:26-29
Isaiah 42:23-25
Isaiah 43:1-7
Luke 9:30-31