No the root cause of this tragedy was the criminal act of theft regardless of whether it was gold gasoline or weed the root cause was theft....

 If we use your analogy the next time somebody steals a car and gets killed doing it we should ban all the cars 

 If we use your analogy the next time somebody steals booze from the liquor store and somebody gets killed we should close all the liquor stores 

 Your analogy and hypothesis are flawed