While private security systems are increasingly used in Spain, in the United States they are practically the norm. Alarms, surveillance cameras, and private guards are common features of the urban and suburban landscape. The American private security industry is gigantic, partly because of a strong belief in self-protection.
In the United States, the Constitution's Second Amendment guarantees the right to bear arms, which has directly affected how citizens perceive and manage their own security. Whereas gun ownership is heavily regulated in Spain, in the United States it is fairly common for people to own firearms for personal defense. This fundamental difference affects not only home security but also how law enforcement interacts with citizens.
Despite possessing enormous private and public security infrastructure, the United States still has one of the highest crime rates among developed countries, especially for violent crimes such as homicide and mass shootings. This paradox has led to endless debates about the effectiveness of gun policy and the state's responsibility for public safety.