Explicit in your original question "Why do so many people need to be so extreme?" is the presumption that standing against police brutality is an extreme position to have. It preserves the status quo. It preserves a world where literal Nazis are accepted as "very fine people".
To answer your question directly, to address systemic racism in America we need to shift the Overton window of discourse. That _requires_ dissemination of values and ideas which many consider radical or unthinkable.
Beyond that, to say someone is dumb and naive because they don't think cops should be allowed to kill people is callous and ignorant when you consider blacks are three times more likely to be killed by police than whites. [https://mappingpoliceviolence.org/]
"Zero is impossible" is implicitly saying, "Cops should be allowed to kill people." Easy to say when it's not your community in the crosshairs.
To answer your question directly, to address systemic racism in America we need to shift the Overton window of discourse. That _requires_ dissemination of values and ideas which many consider radical or unthinkable.
Beyond that, to say someone is dumb and naive because they don't think cops should be allowed to kill people is callous and ignorant when you consider blacks are three times more likely to be killed by police than whites. [https://mappingpoliceviolence.org/]
"Zero is impossible" is implicitly saying, "Cops should be allowed to kill people." Easy to say when it's not your community in the crosshairs.