Antisemites are dangerous, not just because they hate jews. They hate everybody.
“They hate everybody.”
Hating jews was just the given reason. The real objective was the feeling of power and control that killing someone gives the shooter. The same feeling would result from anyone they killed. It’s not unusual for killers to kill their family members before embarking on their spree. Because again, it’s about the feeling they get when they kill. Not because Mom and Dad fit whatever the chosen profile of the target is.
My guess is they’ll find the shooter, who apparently also killed his partner, also killed small animals. He just graduated as killing small animals was no longer sufficiently satisfying.
I was thinking the other day that the killer Norman Bates in the Hitchcock thriller “Psycho” was a cross dresser. The reason cross dressers do it is because they hated their mother. Dressing up as her gives them the power to put her on and take her off. Norman depicted an early “trans” killer before trans was even a thing. It worked because people already understood how crazy dressing up as a woman was.