My brother died suddenly in his home while in his late 40ies. Nobody had heard from him for a few days so my other brother went to check on him and found him deceased on the floor. I lived half a country away but I talked to my now-deceased brother on the phone at least weekly. We were close. Anyway, the brother who found him, we’ll call him W, immediately called his own daughter so they could do a house search for valuables before they notified anyone. W had been wrangling to get a hold of some collectables for many years – so much so that it was well known in the immediate and extended family. Over the years W had deployed various tactics to con his way into getting what he wanted, mostly unsuccessfully.
I think the important point to absorb is that saying “All Lives Matter” is not an expression of opinion – it is a rejection of an opinion. It is not literally trying to states that all people’s lives are valuable – that would be a redundant statement of the obvious. It is stated by way of direct rebuttal to “Black Lives Matter”. It is a rejection of that, essentially saying “I don’t agree”.