Meaning, "All lives matter" crowd who says racism against blacks doesn't exist, or those who oppose BLM say "Why should we worry about them, because they've got black on black crime? We should worry about black on black crime before we worry about white on black crime."
So why should we worry about people entering our country illegally and "causing crime" when we're already doing that. Hell, we have more school shooters by far who aren't immigrants than ones who are. Going further, we have more school shootings than other set of countries combined, globally. https://worldpopulationreview.com/country-rankings/school-shootings-by-country.
So, to paraphrase a Christian proverb, "How can we throw the first stone when we are guilty of crime ourselves?"
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