I wasn't accusing YOU of saying these things, I was drawing on your conclusion that slavery somehow led to the string of transgressions on the left I went on to describe. Slavery is a poor excuse for the way the so-called civil rights movement has morphed into the very thing it used to stand against.
Maybe there is a small psychological level of assumption when it comes to race, but I'd be massively surprised if that had anything to do with slavery. Surely it is more realistic to conclude any such beliefs are driven by the modern day circumstances rather than a long distant past? Blacks are more likely to commit crime, especially against blacks. Blacks are more likely to grow up in dysfunctional families and communities. Part of that comes down to individual choice - there are outstanding examples of people from the most deprived backgrounds prevailing in life - part of it comes from the careful construction of these environments for political gain.
The discussion has been hijacked and it is now "racist" to question the convenient foundations that have been constructed to support the spurious arguments and claims of the left. And it's not just the state manipulating black communities either. The same is true of abusive and regressive organisations such as antifa and black lives matter.
Maybe, at a deep level, slavery does account in some way for what has transpired. It's a reach but, if we assume it is the case, that should be number 500 on a list of issues far more pressing that need to get resolved before any further progress can be made. But these things aren't even discussed any more in the culture of fear that the "progressive" left has birthed. Start there if you want to heal the divides and bring about justice and equality. Point at the guilty of today rather than the guilty from the past.