Final answer:
A security guard's role is to protect people, property, and information, in line with the broader social responsibility of governments to safeguard individual rights and public safety.
Step-by-step explanation:
The role of a security guard is to provide protection to people, property, and information. This is essential for the implementation of freedom in society, which involves the government protecting individual rights, including property rights, and providing a system whereby rights to property and contract are upheld. Furthermore, governments are responsible for securing the rights and liberties of people, demanding respect for the rule of law, and safeguarding citizens from external threats, as exemplified by historical measures such as the "Great Wall" built by ancient Chinese emperors.