Well actually… Thomas Sowell (who is black) talks about how he felt safe going around on his own in Harlem in the 40s and 50s, and never heard a gunshot. So there actually was a fair amount of social trust / actual safety in black communities even then. With the obvious caveat of course that interracial violence was still a risk. But at least within black communities then, yes there was more social trust.
I dont think it is reasonable to take history of one place as told by literally one person and extrapolate from it whole nation.
You have failed to provide an alternate source.
Agreed. So is the solution to reduce white social trust as well or to empower non-white social trust?
I think it might be. When those who benefit from the current paradigm are forced to experience the pain that everyone else has been dealing with, they get motivated change things and they have the power to make it happen.
In practice, this doesn't happen. Instead they vote for people like trump.