Park City Daily News – On Kentucky Derby night 2012 someone murdered Adan Perez. The groom’s body was found in a backside barn at Churchill Downs. No arrest has happened, and almost two years later the case has grown cold. This sad and unresolved situation is symbolic of so much in thoroughbred horse racing now. Despite plenty of positive (as chronicled in a preceding column) there are several serious problems that prevent racing from reaching its full potential and returning to its past position in the pantheon of America’s most popular sports. One stark reminder of racing’s darker side is…