When I lock my front door and leave a spare key under the doormat, my insurance company is not obliged by law to pay for any damages if the spare key is used by

When I lock my front door and leave a spare key under the doormat, my insurance company is not obliged by law to pay for any damages if the spare key is used by thieves to enter my house. I could have easily prevented the situation. Content publishers should properly lock their front doors, too, and not have spare keys lying around all over the place.