There are two problems here, California’s jungle primary, and i REALLY hope that someone is trying to get a referendum reverse this on the ballot, and self dealing by DNC/DCCC tied consultants.
Honestly, a lot of the folks are running because they have been aggressively recruiter/supported by political consultants because they are rich, naive, and not too bright, which is a great way to rack up big consulting fees, because these folks spend big on media, which is where the consultants get their vigorish.
So long as we have a national party apparatus where the professional staff is working primarily for the benefit of consultants, this sh%$ will happen over, and over, and over, and over again.