Who appointed you arbiter of what people should and shouldn't own?  

The so-called "assault weapons" are legal products and are used legally by the vast, vast majority of people who own them.  As long as they don't break the law, what they use them for is their business.    

Is there anything else you'd like to tell people what they should and shouldn't have?  Why should anyone own a car that has over 200 horsepower?  Why should anyone own alcohol?  Why should anyone own anything that isn't absolutely essential for their day to day existence?