Why didn’t 8 years of Obama fix this?

This is not difficult to answer.

The riots of 2020 are political, and although one white liberal goal had been achieved by electing a Black man who was acceptable to many whites--he had no ties to the African American experience of slavery, the KKK and Jim Crow. All foundations of the Democrat Party. But for liberals, he was the right shade. Not too dark. Even Joe Biden made a reference to how acceptable and "clean" he was. Good looking, well dressed. Haaavaard. Not like street fighter Jesse Jackson who had been running forever, was dark, and didn't speak pretty Harvard English.

Plus, in 2008 he was the most radical, outrageous politician on the abortion issue. Born alive? Let them die. Now that's so common and mainstream Democrat it's hard to imagine it was controversial. It got him the support of white liberal women, even though it created carnage in the black community.

But 8 years of liberal goals didn't achieve the anarchist, over throw the government, goals. And one of those goals was to take over the Democrat party.  What was needed was 3 radical feminists to put their heads together and came up with  Black Lives Matter (BLM). Obama was NOT elected to help black people, he was elected to assuage white liberal guilt. It would take 1) virulent hate for Trump both on the right and the left, 2) an outstanding leap ahead for blacks, and 3) a pandemic to guarantee the weakening of the masses to set the stage.