I'm sure we all wish Mr. Nelson well above all else, and that the perps are caught and locked up.  Everyone, please call Crimestoppers if you have any information!  You can report anonymously!
I have no knowledge of the ins and outs of dealing drugs, nor do I wish to.  However, the evidence shows that having a gun in the home is more dangerous than not.  For a good layman's explanation, google 
Good guy with a gun myth: Guns increase the risk of homicide