I realize the topic here is the LDS church, but it is worth putting this in context. The Methodists, for example,
ended racial segregation in their church in 1967, twelve years before the LDS church. But while Brigham Young was saying he didn't want blacks to be equal with whites, Methodist preachers in the US south (and Presbyterian and Baptist ones too) were all preaching not just inequality but that race-based slavery itself was a God-ordained institution.
The LDS church wasn't as strongly against slavery as other churches, but at least their God had supposedly
said in 1833, "Therefore, it is not right that any man should be in bondage one to another."
So the best way to make the LDS church look bad is to see it in isolation, but in historical context, it was somewhere in the middle, not as racist as the pro-slavery churches but not as good as actively emancipationist churches like the Quakers.
It's ironic--and sad, of course--that the LDS church has a mechanism to change doctrine more easily than most, with new revelation, yet they were one of the slowest to change in the civil rights era. And that's what makes them look worse today.