Because the US government is no longer even pretending to care about human rights.
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That's progress though, even if its progress on something that never should have existed to begin with, and the progress is far too slow.
And yes, our progress has been far too slow and way too uneven, but for the first 40 years of my life I felt like we were still progressing (yes -- too slow, and too unevenly).
But in the most recent ~decade of my life I feel like we've switched from too-slow progress to regression.
Shitty progress isn't enough, but its better than no progress (or, much worse, regression).
He only freed the slaves in the South with the emancipation proclamation [1]. The 13th amendment wasn't until 2 years later. Lincoln did it as an economic weapon against the south as well as a military recruitment tool; not out of the goodness of his heart.
[1]: https://en.wikipedia.org/wiki/Emancipation_Proclamation