Two years ago, I invoked lessons from Dr. Seuss’s Horton Hears a Who to talk about about the lack of action regarding gun control and mass shootings. But it applies to what’s going on now as well. Not enough of us have raised our voices against racism in this country. We need more noise. Like the civilization on that tiny speck of clover in the story, there can be no shirkers if we’re going to survive.

If we blissfully thought in the past that being non-racist was enough, we must now realize th...