It's reasoning based on research not speculation. People of color (especially Blacks) and poor whites are more likely to get abused by police and even shot even when unarmed and not a threat - not to mention the abuse by the legal system. Every stage is racially skewed. Whites are less likely to live in areas that are heavily police patrolled. And for crime committed in similar rates conviction rates are way out of proportion - so whites not only get arrested less for crimes they do in fact commit - but they are way less likely to be convicted. Sentencing follows a similar pattern - suspended sentence or rehab for whites and prison for blacks. It's a fact. It does stand to reason that most white people (and yes even a few brown folks who are true believers in our system) are going to say absurd things like "I've never been abused by police - so it must not be problem" or "I've never seen racism - so it must not exist."