Security guard pepper spray is for some security guards, the only immediate self defense weapon that they have at there disposal. Unless a security guard is licensed to carry a firearm or has the benefit of using a more expensive non-lethal takedown weapon such as a tazer, there really isn’t anything else available besides pepper spray.
Even if the user is licensed to carry and use a firearm, many agencies still opt for equipping their personnel with security guard pepper spray. Many local, state and federal law enforcement agencies employ the use of security guard pepper spray. This wide spread use is a testimony to the effectiveness of the agent.