I think it comes down to how both sides view impartiality. There's definitely confirmation bias when the president nominates a judge - often the candidates come

I think it comes down to how both sides view impartiality. There's definitely confirmation bias when the president nominates a judge - often the candidates come from the same party so they share some broad ideological positions. Most judges I think do see themselves as impartial jurists even if the results tend to skew toward political outcomes.