All correct, but the wise landlord realizes that in most cases a property is not trashed overnight. It takes a good while to burn up all the cupboards, a big chest, and a sailboat.
A wise landlored visits his properties periodically, or has an agent who visits in his behalf. Often, particularly with tenants of dubious character, the rent is collected personally on a monthly or even weekly basis. If undue damage is observed, the owner immediately contacts the police, and lodges a charge of criminal mischief. He then visits his attorney, to determine whether and how the people can be evicted; and perhaps to initiate a lawsuit for damages against them.
The matter of how often and how much the owner has a right of access to and inspection of the premises is controlled by laws. But nowhere is the landlord utterly barred from the premises until after the tenants have vacated. Because tenants often vacate without giving any notice, but for such laws the inattentive landlord might have to wait several months before determining that they have gone, and then discovering the damage done.