I think this comes from you being a compassionate person and trying to empathize with those you see as different from yourself, and we need more people in our country willing to look at the experiences of others and not just assume they know what those experiences are.
I do want to point out that sometimes (not saying you to be clear) but I have experienced that white people who grew up in affluent or middle class families have a very different view of what it is like to be white, and they tend to assume that the way they experienced whiteness is THE white experience. In 1969, my parents became the first generation in our family to attend high school. They actually graduated, but just attending was a step up. My mom grew up in projects, condemned buildings, and sometimes homeless. If her younger siblings went too long without food, she stole it. She's not proud of that, but has no regrets either. Her mom worked, but with no education there wasn't a whole lot of money to be made for a woman in those days, let alone now. Her dad was sometimes in jail or prison or mental institutions, it was a lot better when he wasn't around beating people up. My aunts and uncles more or less raised each other. My mom never went to a store and bought shoes or a shirt new. She'd never had a pizza. When she got her first job there were a lot of things she had to learn about how people lived in the "normal" world.
Not all of our dads painted the line. Some of our parents were just as invisible to the line-painters as black or brown people, and obviously still are. My family's experiences with education and poverty and abuse and addiction and everything else definitely influence my perceptions. My aunts and uncles found their way out of poverty. The ones who were older and/or stronger pulled up the younger and weaker ones. They taught each other skills that they learned in the "normal" world. I want that for everyone. So while I acknowledge that the mistrust exists, I also think that real solutions for people living in communities awash in poverty and violence have to include using education to make sure that mistrust doesn't fester into inwardly-directed hatred (hopelessness, despair, addiction, etc.), or outwardly directed hatred (racism, violence, etc.). Yet, the opposite seems to be going on here. People are using this existing "mistrust" for their own benefit, and to the detriment of all the MB's in Ferguson and elsewhere. For money, for ratings, for votes, for venting personal prejudices, for advancing careers and political causes. It's sickening.