People like Losordo have pointed out the “dual birth” of Slavery/Colonialism with Liberalism/Democracy. I would argue it’s not even a contradictory dual birth, they are one and the same. Like you said, it’s not just some oversight that the American constitution claims to be a huge protection of human rights while also explicitly outlining the right to own slaves. It’s the point.

Slave owners saw in America an emancipation, a step into freedom, no more pesky British bureaucrats to hold us back from our full potential. Unlimited massacres, unlimited theft, unlimited slavery is the high ideal that was aimed for. For them, America was a massive democratic experiment precisely because it was a massive slavery system. Because, not in spite of.

These are people who have no conception of equality. They believe themselves inherently superior, and they are only truly free if they are allowed to subjugate and dominate and exploit to their hearts content - but only against the rightfully designated targets. Don’t offend other white gentlemen.