Why are you belittling it as a knee-jerk reaction and sad? A group of people is experiencing horrible and unjust treatment. The implication of the situation is

Why are you belittling it as a knee-jerk reaction and sad? A group of people is experiencing horrible and unjust treatment. The implication of the situation is they don't matter, and the correct reformist statement is that they do matter. Black lives matter also is not the correct statement. It is the correct understanding of the while situation but you need to keep in mind the nuance of language.