Ken Paulson: Crass though it may be, this tweet is free speech

  It’s not just athletes and celebrities that damage their careers with indiscreet tweets.

  A University of Kansas journalism professor has blown up his own career with a tweet following the shootings at the Navy Yard in Washington, D.C.

  His tweet: "blood is on the hands of the #NRA. Next time, let it be YOUR sons and daughters." The tweet was insensitive, disturbing and dumb, and elicited exactly the kind of reaction you would expect.