teach a class on situational awareness.... use topics like the Tueller drill and things of that nature, start off with examples of public shootings that have occurred recently in places like malls and universities and things like that, maybe use the example of the shooting that just took place at Applebee's where the victims b/f put the dude down. Just being generally aware of whats going on around you. I would give good examples where I asked the class to close their eyes and then paint the picture they are walking at night back to their car, and describe each person they see, are their hands visible, are they avoiding eye contact, how are they posturing, did they park in a well lit area or an area they knew to be well lit at night.... there are some things to be said about being at the wrong place at the wrong time, but still having the mindset and awareness to survive.
as you are talking maybe begin to do something out of the ordinary, to see how well they are aware of whats going on, to kind of drive the point home

