It's just been years of propaganda by Republicans, that's all.

"Overall, our findings show that mayors’ partisanship has limited influence on crime and policing. Electing a Democrat rather than a Republican as mayor leads to no detectable impact on police staffing or expenditures on criminal justice, nor does it lead to changes in crime or arrest rates. Racial differences in policing are also mostly unaffected by mayoral partisanship, with a few potential exceptions. Electing a Democratic mayor rather than a Republican mayor appears to marginally decrease the Black share of individuals arrested for several types of crimes and marginally increase the Black share of law enforcement officers. Yet the first of these results is not consistently robust to alternative measures of calculating racial disparities in arrests nor the use of alternative research designs, and the latter is not verifiable using reliable data."

They act as if Dem Mayors are all-powerful. That's NEVER been true; most must answer to City Councils.

The dirty little secret is that it's a way to blame black folks without saying so.