Because it's a much bigger problem that the liberal mass-media won't cover because of the political agenda.  In 2016 apx 250 Blacks were killed by police nationwide. The majority of those shootings were investigated and deemed justified.  Up to this point in 2017, almost 480 people have been shot and killed in Chicago and over 2200 have been wounded, the majority of he assaults being Black on Black.  Mr. Cho, it's willful ignorance like yours that is a major contribution to this cultural downfall we are experiencing here in the US