Who do you see about an incompetent, mentally ill, corrupt or abusive judge? You can complain about a physician to the state board of medical examiners who license them. You can go to a state licensing agency or the bar that licenses and monitors lawyers. But where do you go to redress a grievance about a judge. Why is this professional class sacrosanct and beyond discipline?
You can complain to the California Judicial Counsel, which has seen fit, in their approximately 70 years of existence to remove right around three judges. So in all those years, all those probably hundreds of thousands of judges, only around three have been bad enough to remove.
Remember this story about the Oklahoma judge using a penis pump while presiding over cases?
https://medium.com/sex-with-a-side-of-quirk/oklahoma-penis-pump-judge-donald-d-thompson-f05923a24b80