Three of the four judges who voted in the majority were Republican appointees.
Republicans have made plenty of disastrous choices, too. I think, more often than not, the judges appointed by Republicans have had moderate/conservative judicial records but then moved left once appointed. But in California there are few real conservatives and I can imagine Arnold nominating some “Republicans” who are more like Trotskyites. In Mexifornia, they’d be considered social and political conservatives!