Well Tom and Dave are of Chilean and Cuban parentage, and the producer they’ve worked with the most, Rick Rubin, is Jewish. Slayer are rubbish white supremicists.
They just take inspiration from twisted and controversial stuff, hence singing songs about Nazis, Satanism (despite Tom Araya being a Catholic!) and serial killers.
Feel really sorry for Jeff with his manky arm, but also slightly amused by something that sounds like it could be a Slayer song. “THIS IS…NECROTIZING! FASCIITIS!