@BigGame90
You're 100% incorrect. This is actually a subject I know a ton about. Teams leaving Oakland has nothing to do with crime and blight, and everything to do with securing funding for new facilities.
Let's first look at Oakland itself. A blue collar city with a population of just over 400K. When accounting for the uncounted and/or undocumented, both legal and illegal, we could even say closer to 500K. Similarly sized cities are typically the centers of their own metropolitan regions. Portland, Oregon, at over 600K, supports one big four sports team. Kansas City at over 500K supports one. San Antonio at 1.5 million supports one. Seattle, at 750K is the center of an economic super region. And while it now has three teams with the expansion Kraken of the NHL, it still lost it's basketball team to Oklahoma City of all places! OkC, at 700K, has one team. All those cities are centers of metro regions. In the cases of Portland and OKC, etc, they are the metro centers of entire states.
Now let's look at Oakland. At about 450K, Oakland is the third most important city of it's metro area, behind both SF and San Jose. If you acccount for the NorCal super region, it drops to 4th, also behind Sacramento, barely above Stockton. Oakland, as a city, was never meant to support one team. Let alone three. So how did it happen?
As I said before, it has to do with facilities. It built a mid-major city back when manufacturing was still a thing in this city. There were several factories. Dow had headquarters here. Clorox. American Steel, to name a few. And it was, and is, home to a major port. The die was cast for growth. They built the Coliseum Complex to house it's only homegrown team, the Raiders. Then wooed the Philadelphia by way of Kansas City A's, and the recently relocated Philadelphia Warriors, who had been playing in San Francisco. The city reached it's plateau though, and then regressed. The tech boom that rebuilt SF and SJ into it's current iterations skipped Oakland. It became a relic of a bygone era.
Facities though. Now for the payoff. The A's/Raiders and the Warriors were all in dire need of new facilities. The stadium was the oldest in football, and only mixed use facility left in sports. Cities moved to more traditional intimate baseball only facilities. The A's wanted to do this. The city fought them on every propsed location. Some were very good ideas. Then the money dried up. It's is next to impossible to secure a publicly funded sports facility in today's America. They are almost all privately funded. So starting with the Warriors. Warriors games always sold well, even when they sucked. It takes more than that to support an arena though. You have to think about concerts and private events. San Francisco never had a true arena. The Warriors played in the now 120 year old Civic Auditorium, renamed in honor of the great Bill Graham. (Promoter, not evangelist) Ownership decided that if they, along with Chase Bank, were putting up the money, they wanted to make a big splash in a true big city. So with no funding, land provisions, or material help from the city, against the protest of many, they built the Chase Center. And even it hasn't booked events at the rate they thought it would. Now to the other two teams.