The parents must have talked to lawyers, and this is was they are saying in an attempt to avoid lawsuits.
My thought too.
Wasn't the shooter over 18? Why would his parents be concerned about lawsuits? They're not legally responsible for him anymore.
If they were legally responsible for him, it appears they clearly would've kept him in mental health care.
I just don't see how they're liable once he's passed 18 and he was allowed by the state (again, no one stopped him) to discontinue treatment.
Granted, the parents are failure by themselves -- this however sounds more like a failure of the State's mental health resources to properly identify him as an 'at risk' individual.
The killer is an adult. His parents may not have any legal liability. California is a crazy state, so a jury may find that they do, but in a sane world parents are not responsible for the actions of adult children, any more than children are responsible for the actions of their parents.