Inflammatory headline, but still a good read.
Witnessing all these shootings and killings creates a constant state of terror within minorities, not altogether different from the effect larger populations feel witnessing passenger planes flying into buildings, or gunmen cutting their way through schools and shopping malls, or children blowing themselves up in cramped bazaars. The issue doesn't involve absolute numbers; it involves the effect of knowing that at any time, your number could come up.
The difference is that when the Boston Marathon is bombed, or people fly planes into buildings, or an aggrieved loner goes on a killing spree, we, as a society, pursue justice to the very ends of the earth, if only to sleep better at night. When killer cops rarely, if ever, even step foot in court, let alone get convicted, the absence of immediate justice or punishment leads to an unaddressed fear. It's a fear of ubiquity; a fear that the carnage can be easily replicated, virtually anywhere, by virtually anyone; a fear that our lives don't matter.