“California law is embedded with statutory and common law immunities that protect particular persons under specified circumstances from liability for identified conduct. Immunities reflect a public policy that, notwithstanding occasional harm, the immunized person or activity is more important than is the otherwise applicable principle that there shall be no wrong without a remedy.1 Immunities remain the exception from the important societal goal of compensating injured parties for damages caused by willful or negligent acts of others.”
[California Affirmative Defenses [certain citations omitted]]