That's all true, but you neglect to mention his third act, which was to renounce the KKK and his affiliation with it, in the strongest terms over the last twenty years of his life, loudly, publicly, and at every opportunity. His legacy - like some of the men commemorated by these statues and names - is complicated and nuanced, with a long record of effective accomplishments tainted by an equally long record of upholding white supremacy. But at least in the case of Byrd, he had a reckoning and the good taste to repudiate that life, and well before he was on his deathbed, too.
But according to cancel culture, you can't evolve, rethink or apologize for your actions. Once it's done, it's done. There is no going back, you are branded for life.