The reason "All Lives Matter" provokes outrage is because it is not the focus of the movement.
It's akin to crying "ALL FORESTS MATTER!!" in response to "Save the Rain Forests". "Save the Rain Forests" doesn't mean the rest of the forests don't deserve saving, its just a focused movement and message instead of something as broad as "Save All The Forests"
Yet there is not substantial evidence that black people are
solely affected by whatever. It is not proven to be a racial issue. Just as aforementioned, media outlets only report when they think they have a controversial story, and only air stories about white cop on black citizen. Then, "oh, because he's black, and the cop is white, racism is to blame!"
Still, there is no reason for BLM to be outraged if they generally believe what they claim they do. A movement that is against police violence covers a movement that fights against police violence under its umbrella. Race is not relevant, since they are fighting against police violence for everyone, which includes black people. Your brown townogy is false because deforestation heavily impacts the rain forest more than anything. Police violence is police violence, period. A movement that selectively addresses it can only prove harmful in the long run.