[Pearls Before Swine]

The obvious reason for this is unstated context.

Black Lives Matter is so aggressively promoted that I take it to have the meaning of “Black Lives Matter MORE”... or “ONLY Black Lives Matter.”

“All Lives” is clearly a reaction to that, and just brings the balance somewhat back to neutral.

[SmokingJoe]

Black Lives Matter is so aggressively promoted that I take it to have the meaning of “Black Lives Matter MORE”... or “ONLY Black Lives Matter.”

That is esxcty what Black Lives Matter is pushing.

“All Lives” is clearly a reaction to that, and just brings the balance somewhat back to neutral

Nonsense.
Every single life on this planet matters. Black lives are no better no worse than anyone else’s.