What legal concept allows a security guard to use reasonable force?

The concept of self-defense is a legal principle that permits an individual, including a security guard, to use reasonable force to protect themselves or others from harm. This legal standard requires that the force used be proportional to the threat faced and necessary to prevent injury or damage. In the context of security work, if an individual perceives an imminent threat, they have the right to respond with reasonable force to neutralize that threat, ensuring the safety of themselves and those around them.

While the duty to protect pertains to the obligations a security guard may have to ensure safety, it does not explicitly grant them the authority to use force. Similarly, the right to trespass refers to property rights and does not relate to the use of physical force. The principle of necessity may occasionally justify actions taken under extreme circumstances but does not specifically apply to the use of force as self-defense does. Thus, self-defense is the most pertinent legal concept allowing for reasonable force by security personnel.