I respectfully disagree. The Dims wanted to be on record as being the party of the Juneteenth holiday to try to make the dumb masses believe the Dims were always on the side of slaves. Much like the Dims want the masses to believe the Dims were the ones who ended segregation.
The Dims don't have to explicitly lie like: "Hey, we're the party that ended slavery and segregation to free you from evil Republicans". It works to just make the masses FEEL like the Dims were on the right side of history. Facts don't matter. Feelings do.
Very good points. Feelings over facts.