Due Process must be fair. For a governing body to decide the fate of a person's fundamental right to protect himself, they MUST present him an opportuntity be able to defend his actions, and these actions must show or be based upon the commission of a crime. For example, if he was found Guilty of inciting - then the removal of his Gun Licence would be based upon an established act, a consequence of his actions as determined by a Court of Law, not a group of 'elites'. At this point in time, he has not been tried, let alone convicted. A 'punishment' was thus admistered without Due Process.
Under this method of operation, the Police Dept would be free to incarcerate him, and/or confiscate his home, possessions, finances as well. All they need do is 'investigate' - who needs a court system and all that hassle? After all, can't any of these be used to commission the crime they have merely accused him of contemplating?
What we have, is an unelected group of people, who have taken it upon themselves to deprive rights secured in the Bill of Rights - without a trial, without Constitutional authority, and without redress. Will this same commission now revoke his Driver's license? How about his Title on his house? Can they revoke the license for his car? You know, just to be 'safe'?
Now, with that said - let me re-iterate lest this point be forgotten. What this man did was recklessly abuse his Freedom of Speech, inciting others to commit murder. For this, he should be tried - and if found guilty, should be punished. As a part of his punishment - I have no issue with stripping his Gun License. But, that is not what has happened.