Excellent question. I don't have an answer, but I've run into similar problems with trying to get employees to exercise "situational awareness" when entering and leaving our bank. They don't think it can happen to them. I would relate war stories of the less than bright things I've seen, but it might hijack your thread and no one would believe them anyway.

I really would like to have some ideas on how to get people to take prep seriously.

I've come to the conclusion that until something really bad does happen, or almost happen, people are so safe today that they can't really accept that anything bad will happen to them. The only recourse we have found is something along the lines of "do it this way all the time with these precautions or you can/will be fired." It still doesn't solve the problem, but maybe takes the edge off a bit.