Just as there were thousands of blacks who owned slaves. Some even sold their own children into slavery. Inconvenient facts.
Quite true. Now some large percentage of blacks who “owned” slaves had bought their spouses or children out of slavery and were not allowed by the state laws to free them legally.
IOW, there are layers upon layers of caveats to this entire discussion. And we need to keep in mind the difference in scale between black and white ownership of slaves in this country.