LA hasn't been a nice place to live for a long, long, long time.
Actually LA has some very nice areas, with some of the best climate on earth to boot, as a matter of fact, there are probably more wealthy folks that live in and around LA than any other region of the country. I am talking private jet aircraft and elevators in their homes. Big bucks.
I could name at least 30 areas around the greater LA area that are outstanding beautiful, places. Unfortunately, you need big bucks to live in those areas......If these areas were not super nice, with weather to match, the super rich wouldn't be there.......Plain and simple......