Mass shooters have no particular ideology. Crusius and Betts were opposites ideologically. (Though both cared deeply about the environment.) Nor are mass shooters a white problem or a black problem. Over the same bloody weekend, William Patrick Williams, who is African-American, appeared in court after being arrested by the FBI for planning to shoot up a Texas hotel with an AK-47 rifle.
Looking at the data from the Mass Shooting Tracker, widely utilized by the media, as of this writing, of the 72 mass shooters, perpetrators in shootings that killed or wounded 4 or more people, whose race is known, 21 were white, 37 were black, 8 were Latino, and 6 were members of other groups.
51% of mass shooters in 2019 were black, 29% were white, and 11% were Latino.
Three mass shooters were Asian, two were American Indian and one was Arab.
Well, the obvious solution is to confiscate guns from rural white males.