Tehillim. Psalm 106 - A Rebellious History

This historical Psalm is written from a position of Exile. It speaks of Israel's constant waywardness and rebellion against God, from the days of the Wilderness, until the Land of Israel, frequently disloyal, and ungrateful to God's manifold gifts and wonders. Why then is this a chapter of praise? Why is this chpater animated by an upbeat mood?