Certainly a bad day for the range (mess to clean up), but this happens fairly often and has nothing to do with the 2A.
For years, many ranges have required that a shooter either a) be with some one else, b) bring their own gun, or c) have a CHL. These tend to decrease the likelihood that you are there to commit suicide.
Send lawyers, guns, and money...
(Formerly known as "Henry Bowman" on THR)