So this is terrorism, right? Not a crime anymore. These acts have a clear ideology behind them and are trying to achieve a political will.
I expect the shooter will be charged with a series of "hate crimes." iirc, in the United States, the terror you are trying to inflict on a population by murdering a small number of that population is not itself a crime, only the murders themselves are. As an example, Dylann Roof openly admitted that he was a White supremacist and was trying to spark a war. The people in the church weren't his (only) targets; in murdering 9 people, he was actually
attacking ~37 million of us (or more, if he would include Jews, Latinos and White 'race traitors' as targets of the war). If Roof believed that his attack on the church would affect only the people inside the church, I think he might not have bothered. He saw his actions as taking place within a larger picture, but our criminal justice system doesn't. (And to be clear, this isn't a broad, philosophical principle at work, of focusing only on the individual crime and the immediate victim. We
do have laws for going after people based on the 'bigger picture.' Racketeering laws for taking on organized crime, for example, where the overall crime is larger than the sum of its parts. Racketeering laws have been used to pursue people for insider trading, and have recently been used against the folks involved in the college admissions scandal.)
EDIT: CNN notes that the FBI is "opening a domestic terror investigation" but doesn't provide any more detail. It could mean they'll pursue people associated with the shooter - "aiding and abetting", or what have you.
Just now I'm hearing about another shooting, in Dayton, Ohio. 9 dead, 16 injured, so far.