My brother lives in Tijuana so I am always hyper aware of news reports about crime. There has even been bodies found within a few blocks of my brother's home. But, so far and as far as I can tell, those killed are somehow involved in law enforcement (upstanding individuals who are fighting crime or corrupt individuals) or the drug trade. These are not random murders. However, my brother doesn't venture out at all hours of the night just to be safe even though he is over 6 feet tall and 250 lbs and looks ferocious. Even he knows not to tempt things.
So, please do go to the OCC, just be an informed traveler. The OCC happens to be a 5 minute cab ride from the border (always choose the drivers with the uniforms and name tags as they are part of a union) and is located in the absolute safest part of Tijuana - the Zona Rio.