The cult of aggrieved White victimhood was strengthened by media representations of the Oklahoma City Bombing, which enshrined the tragedy as "the worst act of terrorism on U.S. soil" (now superseded, of course, by the 11 September attacks, to which most of the comments here apply equally well). According to the media, the victims and the institutions that McVeigh attacked were White, which is not to diminish the deaths of people of color in OKC, but only to recognize that the public face of the Oklahoma City Bombing constructed by the media was almost entirely a White face.
But by any objective measure the 1921 Tulsa Race Riot was a worse act of domestic terrorism than the Oklahoma City Bombing. White mobs in Tulsa killed about 250 African Americans, destroyed 1,400 homes, and devastated the Greenwood district of Tulsa, one of the most thriving and economically vibrant African American communities in the entire country at that time. (If you want to learn more about the Tulsa Race Riots, two books are newly available: Tim Madigan's The Burning: Massacre, Destruction, and teh Tulsa Race Riot of 1921 and Alfred L. Brophy's Reconstructing the Dreamland: The Tulsa Riot of 1921: Race, Reparations, and Reconciliation.) Most White people simply cannot comprehend the 1921 Tulsa Race Riot as rioting by White people, but that's precisely what happened. It's crass and insulting to compare the dimensions of human tragedy, but the media started the quantification game, and if they're going to play it, they should be made to play it fairly.