Unfortunately, switching off the lights when leaving the building becomes dangerous in Latin America and south Europe (especially Italy and Spain). Burglaries are very, very common, especially in my former country (in the city where I was born, until I moved to Brazil, there was a burglary each 2 minutes). When tenants switch off the lights, the thieves easier know the apartment is empty, so break-ins multiply. To not talk about the phenomenon of abusive occupation. Sadly, we need to spare resources by other means but switching off the light.