IN A NUTSHELL
The majority of Haazinu is seventy lines of a song that Moshe sings to the Israelites. He then blesses them and climbs Mount Nevo so that he can view Israel before he dies.
The song of Haazinu is one long, beautiful poem describing the relationship between God, who is always just, and His often-rebellious people. A key idea within the song is that the covenant should be kept by both God and us, but if one side fails to fulfil their covenantal duties, the other party can bring a case against them. This kind of lawsuit (in biblical Hebrew, a riv) is often referred to by the later prophets, usually as an accusation by God against the Israelites but occasionally the opposite.
We see the same idea in the High Holy Days of Rosh HaShana and Yom Kippur. This is the time when God sits on the throne of justice and passes judgement on our behaviour. In our parasha, though, rather than using legal language of the contract, Moshe uses high poetry, speaking not just to the minds of his listeners but also to their emotions and imaginations. Yet the theme remains simple: God is just. It is we humans who are the source of injustice in the world and who must work to heal the fractures.
QUESTION TO PONDER
Why do you think people tend to blame God for whatever goes wrong?