I don't make a distinction between where my legal obligations as a landlord end and where my moral obligations (as a human) take over. Or, to put it another way, "legal obligations" are only relevant to those who have no morals.
Several years ago I purchased a small apartment building where one of the tenants was a hoarder. Shortly after the purchase the Fire Department came inspecting and issued (to me) a violation notice regarding the potential fire risk which had been created by the tenant. As I understand it...