Right after someone dies, there may be people mourning them, so it's terribly disrespectful to criticize the dead person. That concern about disrespect is largely about respecting the mourning process.

But, after some time has passed, we should be able to discuss and evaluate a person's impact (good and bad). Otherwise history would be impossible to write.

It's been eight months. I think it's okay to acknowledge the full range of what Davis said.

Grandparent comment didn't say Davis was terrible, as you claim; the words were "He said some terrible stuff".