You have to wonder just how California chooses to define “mental illness” for this purpose. And you might also wonder how many of the targeted individuals have ever committed a violent felony or are truly likely to do so... as compared with the recidivist criminal element that the state might otherwise choose to address... if it were not so dramatically overrepresented by other, “protected” classes of people.
I believe “mental illness” means anyone who has ever admitted to being depressed or prescribed Xanax or similar drugs.
They are using this to make more and more people unable to own firearms.