I was advised by Essex FRS that 90% of fires are put out by the public.
Every week I meet someone who tells me that their policy is to evacuate and ignore the fire. Every week I tell them a true story about a child's clothing catching fire, and ask them if they would walk away from that fire.
What if the fire is in the escape route?
Also, just about everyone I speak to, after some discussion, agrees that they are unlikely to ignore a small fire, accepting that it is in everyone's interests for them to put it out, especially when you weigh in the real risk of evacuation problems.
I belive that even the health and safety at work act (I am not sure, but one the H&S laws does) places a duty on employers to train employees on the use of the safety equipment supplied to them.