I don't agree with that. Is it also the landlords responsibility if the door is kicked down and the tenant has their things stolen? Or someone climbs in an open window and steals the car keys and the car? That is why tenants should pay insurance.
The difference between those scenarios is that some random criminal caused the loss to the tenant - not something wrong with the house.
Note if there was something wrong with the door or window (locks broken) that allowed the criminal to get in, then the tenants might have a partial case against the landlord for the loss as well.