I think we can talk about history - and Black history - without it having to fulfill some external function like making people feel good or bad or inspired or whatever. At the very least it's just one more historic anecdote about how bigotry kneecaps entrepreneurship and stifles talent - so we should strive to judge people by their character and talents and not conscious or unconscious biases or what social convention dictates.

Also - why a company might have failed is always relevant to discuss even if it leads you somewhere uncomfortable.