Well the event was within the Constitution and freedom of speech...If some one was attacked w guns every time we did not agree with what they say or did and every disagreement was solve w gunfire, would this still be America? They had the right to hold the event no matter if you agree or not but the bad guys did not have the right to shoot them...
There is no argument about what you said. They had the right to hold the event. The good guys planned ahead and when the threat came they took it out quickly and efficiently. It was virtually a perfect response to the threat.