If possible (I know, in CA, unlike here in TN with a Republican legislature and a Republican gov., that’s a big “if.”) you should get a CC permit and pack heat.
He likely can’t get a CC permit where he lives. Only in a few rural California counties (like where I live) can you get one.
Not possible in most areas along the coastal counties (where the libs control politics). For example, in San Francisco only a handful of people were issued CC permits, perhaps 5. One of them was Sen. Dianne Feinstein (one of the privileged few). She is anti-gun, and it looked bad so she may have given it up recently (because she has bodyguards). Only certain big-shots get them.