That strikes me as curious. While I'm certain there is a reasonable explanation, i.e., "This is a report on foreign governments.", it would make sense to include themselves. Why do you suppose that is?
Because the American government could not care less about those violations in other countries, and they just issue those papers as propaganda?
In fact, if you read your modern world history, America was behind tons of the worst violations in the first place, supporting the regimes that perpetrated them as long as they catered to the US interests. They have setup lots of dictatorships in Latin America for example, they had armed Bin Laden and co, they have best terms with Israel and Saudi Arabia, the had Noriega as their puppet man, they had supported Saddam Hussein (yes, that Saddam) against Iran, they had toppled the democratic government of Iran to install a dictatorship in the sixties, etc etc.
If I had the mass genocide of Native Americans, the slavery of blacks, segregation till the '60s, concentration camps for Native Americans and later Japanese, McCarthyism, 2 atomic bombs on civilians, Agent Orange, and medical experiments without their knowledge on latin populations on my hands, I would be too ashamed to publish anything about any other country's "human violations".
Don't forget that much of Iran's ire against the US is fallout from the US-backed coup overthrowing Iran's democratically-elected government in the 50s.
