Well I'm no fireman, but I have used one several times. It might be dangerous if you were dumping the stove full...but we are talking about ounces of fuel, not pints. You can boil 2-4 cups of water in less than 10 minutes with a single ounce. No need to put in anymore than that.

Although I see your point, I've never had any problems, but then I'm only burning an ounce to ounce 1/2 at a time and the fuel that you are using..denatured alcohol..is not violently flammable like Coleman fuel or gasoline.