It only demonstrates that there are a lot of search terms that match those criteria. Without diving into each source, we don't know what's even relevant to this conversation (we have no idea how "police culture" is defined in each of these sources, for example).

> Your second claim is false. See my reference to the diversity of the ferguson police department. You are simply shown to be wrong on this count.

I saw your reference to the diversity of the ferguson police department, but it has no bearing to my statement. Pointing out the racial disparity between the Ferguson PD and the community it serves does not disprove the notion that police come from diverse communities, nor that police serve diverse communities. It merely proves that in Ferguson, the racial composition of the police don't match that of the surrounding community.

> Also, nobody has said anything about convergence on a single hateful culture, and nowhere is there anything that requires a biased culture of policing to have occurred spontaneously. That is simply a straw man.

Unless you're proposing that police bias is organized (e.g., conferences about how to better oppress black Americans), then it is necessarily spontaneous if it exists at all. If you want to make a compelling case that racial disparities in criminal justice are principally caused by racist police, you had better at least provide a good explanation for how such a diverse occupation might become racist (in particular because the officers most likely to abuse force are themselves minorities). In particular, it is well-documented that African Americans commit more crime per capita than other American racial groups, so your case must sufficiently explain why these data are inaccurate or how to better interpret them.