Whilst agreeing - Surely the context is everything
Not a single person is saying White lives don't matter - But certain posters want to make out that this is what is being said, it isn't
Next time I see a "Save the Whale" ad do I go ballistic because no-one is saving the Sharks?
If someone says "Donkeys Lives matter" (As they have been historically mistreated for example) does that mean they are saying "Horses Lives don't matter" because I am aware some of them have also?
In the Vast majority of instances we know why the Facebook shouters are spreading their "All Lives Matter" message & "Why No Protest for X/Y or Z" message.
It's to detract away from and to try and discredit the BLM Message - Is Gaslighting the Phrase used?
As for the drawing of parallels to the Reading incident
People saying No outcry etc, rubbish, it's been reported on, commented on and discussed as it always is for the Horrible atrocity it is. The perpetrator has been caught and will be punished by the Law/Authorities in the appropriate way.
People can protest about it if they want, Go ahead, fill your boots
But it doesn't alter what Black people, LBGTQ or any Minority are protesting about, They are quite entitled to protest until they feel they have gained equality, not only in Law (Which took far too long to come about, but in day to day life and situations were those minorities are still not being treated equally.