We build security solutions to protect our networks from the rest of the internet, but do we do anything to protect the network from our own employees and users?  The first line of protection for your networks is not the firewall or other perimeter security device, it is the education and protection of the people that use the network.  People are concerned about having their apartments or homes broken into so they put locks on the doors, install alarm systems, or put surveillance equipment like security cameras around the property.  They are vigilant about making sure that an unauthorized intruder cannot enter the home easily without detection and alarms being raised.