I flew into Oakland International Airport around 10 years ago. It didn’t seem that bad back then. I guess it got worse.
I live north of Oakland, in Marin County, but once in a while, I will travel there. There still are some nice, orderly neighborhoods, especially near Piedmont or North Berkeley, but the questionable areas have become more filled with questionable looking people, compared to a few years back.
It has always been bad in one way or another. I was stationed there in the early 80s and it was simply unsafe to go through the town at night via the buses and walking to get to and from the naval base.