>The idea that 400 years of structural racism can be proven seems highly doubtful to me.
We had slavery in America from 1619 until 1865. Jim Crow and segregation for 100 years after that. The Civil Rights Act, and related laws, eliminated much of the legal basis for institutional racism. But as we all know, that didn't eliminate racism. Safe to say, there's plenty of racism left in this country. Especially in institutions like the police. That's 401 years.
ETA: That's focusing purely on the black population. If you count what was directed against the native populations, you can go back even further.
The idea that 400 years of structural racism can be proven seems highly doubtful to me. Do you really have 400 years worth of evidence of literal outright racism? How can we hope to inspire change with rhetoric like this? This is the equivalent of simply screaming louder to get a point across. Highly ineffective unless annoying them into submission is your goal.