Regarding your second request, you link to my response to someone who deleted his/her statement. And I do not remember that other person's comments. I should not comment on the item you mention because it's out of context, when the item I referred to is deleted.

In general - regardless of what the professor is saying - the problem I am addressing in several comments in that thread, and that others have addressed, regarding responses to BLM, is that the context is important. Many of these responses to BLM, including comments link 'White Lives Matter' or 'All Lives Matter', is that the significance of each statement depends on its context. The statements are not themselves important, or even false, if taken out of context. The message is important, and the message is that the context should be considered. Thus, the actual message of the phrase, Black Lives Matter is its context, not the simple and obvious fact that their lives matter.