Possibly an all-time low. It's hard to compare numbers >40 years old, because they very possibly are not measuring the same things.
As to ease when you "start extremely high" -- SF is now safer, when it comes to violent crime, than most major cities in the US. What it does have is an extremely high rate of quality of life crime.
As to ease when you "start extremely high" -- SF is now safer, when it comes to violent crime, than most major cities in the US. What it does have is an extremely high rate of quality of life crime.