Don't make jokes about the crime rate even around the SF opera house. I had a 72 old co-worker so good at the handball court that he took on young UC jocks, and nearly always won. But one night walking back to where his car was parked, there after a downtown SF event, he was beaten up by a group of young thugs who did it simply for the cruel fun of it, and left nearly dead. He was in the hospital a long time, and never fully recovered.
Likewise, there have been quite a few brutal muggings of the elderly in Oakland Chinatown recently, with some fatalities. Even a former US Senator was mugged in that neighborhood this past year. It's not such a bad area itself, except that it's just a few blocks away from that portion of town which truly is awful. It creeps the heck out of me seeing tourist teenage girls running around naive there, when human traffickers and pimps are, unbeknownst to them, within walking distance! - yet actually patrolling for victims in cars. My wife and I actually witnessed one such abduction ourselves, but yelled loud enough to briefly distract the criminal, and the girl managed pulled herself free from the car. We escorted her back to her irresponsible parents two blocks away. Likewise, portions of Emeryville have a lot of lowlife criminal types hanging around nearby. Gotta keep your eyes open, even during daylight hours, but especially at night.
There are two categories of crime statistics. Those released to the public, and those you have to research for yourself. It's very common for a big shopping center, for example, to work very hard to keep a squeaky clean reputation even when undeserved. Likewise, college campuses. But around a dinner table at the home of a police Detective or Swat officer, it's a whole other story.