Is Pasadena malibu and glendale and burbank the safest areas to live in,and how come there is a big crime?

rating for the 'hills' in hollywood i thought there was houses there for 5 million plus,on lalife it gives a rating for the hollywood hills a 2 how could it be dangerous i thought it was an elite place,and it says the safest places are santa clarita,calabasas,burbank and glendale, and malibu.I will be working in century city in six months but i am having a terrible time trying to find the best location for me i am 28 so i want to be in a nice location with people my age with a good social scene,any help if you could point me in the direction of some places or websites i can check out thanks so much