“The Constitution protects us from the government, not us from other people.”
But liability laws do and there is a difference between liability and rights.
As Justice Thomas pointed out, owning guns is spelled out in the Constitution; abortion is not.
The Constitution does not shield a person from the misuse of a firearm. But to transfer liability from the person to the manufacturer of a product that is not defective opens up a endless stream of litigation that would paralyze manufacturing.
Hence the reason for Newsom's law.