California needs a law banning sharp objects and BMWs.
The USA needs a law banning gallactically stupid Senators and Representatives. Not much chance of that either. The rule is..if you've failed at everything else try politics!
Blunt objects, too, since the first three murders involved use of a hammer as well as a machete.
(Or maybe California needs a law that allows crazy people who are a danger to themselves and others to be kept in soft, safe padded cells. But since that would by definition include many California politicians, it's not likely to happen.)