Not to absolve white killers, but there have been numerous mass killings perpetrated by blacks in the last twenty years or so. It's just not emphasized as much by the usual suspects i.e. Big Lib Media. Actually more mass killings per capita by blacks than whites.
In this case, I wouldn't necessarily blame the "big lib media".
Let's say there was that Pittsburgh shooting this year, maybe 6 people or so died.
Numbers-wise, that's not up with the Aurora shooting and things such as that.
If a minority participates in a high volume mass shooting, such as Virginia Tech and the perpetrator Cho, that is going to be reported because a lot of people were shot.
But you have something like Sandy Hook right before Christmas, that's going to be reported.
Sure, it may well be that blacks are involved in more mass shootings, however that is defined, shooting more than 2 people say; it's not the media's fault that they are not out following some that are not nearly as sensational in nature.
Some obscurer event that qualifies as a mass shooting in Toledo or whatever.
So factually, maybe it is true, blacks are involved in more mass shootings, 2 or more.
It's the big ones that get the attention of the press.