First, I don’t know of half your killers listed. Actually I only know Wayne Williams and the Snipers but latter are spree killers. NO ONE heard of this Sam Little until now, because he wasn’t arrested for any serial murder.
I can probably easily name 8 white, or presumed white. But then, I kind of have a hobby checking into mass and serial killers. BTW technically Snipers are spree killers.
Green River Killer, BTK Killer, Jeff Dahmer, H. H. Holmes, Zodiac, Golden State Killer....I’m sure if I think more today I’ll come up with more.
Mass killers also majority white, certainly the most famous ones. It’s only recently, last 10 years or so, that mass murders in the US got more multicultural. Kehoe of the BATH bombing, UTX tower killer, Columbine, Aurora, Newtown, Charlotte Church killing (only truly racist incident I’ve seen in my lifetime), etc.
“BTW technically Snipers are spree killers.”
No, they are not. No more than any military veteran is.