All Lives Matter is a movement that, despite its stance, reflects a view of racial dismissal and denial about the reasons the Black Lives Matter movement started.
For many, yes, all lives do matter, they have importance, no one person is lesser or better. However, the movement itself erases the fact that the societal controversy is not about white people, it’s about black people and the targeted mistreatment they’ve suffered for centuries. Despite the wars, laws, and reforms, there's still gross mistreatment of black people.
To dismiss the fact that there is a racial difference in treatment denies the fact that there is injustice as a result. Unfortunately, race is a lens through which society defines individuals. They are more, and that is what the movement tries to make people understand. That Black Lives to Matter like other lives do, that there should be equality despite race or color.