Because if the fire alarm wakes me up, I'm getting my family out of the house. The gun, cell phone, and flashlight are probably coming with me as well. Chances are it'll be too late for a little fire extinguisher to put out. Fire extinguishers are good for small fires, if you catch them fast enough. You don't try to put out a raging fire with a collection of fire extinguishers.
Finally, I don't smoke, so my bed will not be the first place to catch fire.

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