Legal Question in Landlord & Tenant Law in California

To have liability, there must be a duty owed by the defendant to the plaintiff. While preventing crime is required to some extent, the landlord does not have to make the area a crime free zone. That is especially true where it is a mobile park so open to cars coming and going at all times. Unless there had been prior such criminal acts and the landlord had not informed anyone, I do not see how the fire was his fault. The question of whether he has insurance coverage thus become irrelevant.