These memes make some very important points in the sense that people of virtually all ethnic and even socioeconomic backgrounds can be victims of police brutality, whose ranks include everyone from mayors, professional athletes, suburban teenagers, upper-middle-class white women, active-duty military personnel and off-duty cops, to the poorest people who are homeless or living in urban housing projects. But obviously, it is the poorest and most disadvantaged people who are the most likely to be the recipients of this kind of treatment.
Unfortunately, when middle/upper-middle-class people hear about these incidents, they tend to dismiss them as the actions of rogue individuals while failing to recognize the institutionalized and systemic issues involved. The lower middle class tends to be socially conservative and pro-“law and order” because their class position is tenuous and they don’t want crime or disorder threatening what they have. But the very poor, particularly in densely populated urban areas where police brutality is the most common, experience police brutality the most frequently and recognize its institutional function, and do not simply attribute it to a few bad apples here and there. And the very poor in urban areas tend to be disproportionately black, often by a wide margin. Hence, the discrepancy depicted in the memes.