Eod, do you have proof of this?
Dakota, have you read the destructive device definition? Any rocket with over 4 ounces of propellant or a missile with more than 1/4 ounce explosive charge is a DD.
Could someone own a missile launcher? Yes. Does anyone own a missile launcher? I seriously doubt it.
Stopping power: The power some guns have to make you stop what you are doing and get your wallet out.