Again, if you subscribe to the principle of free speech, it would be wrong for the police to remove people trying to advance new or even repugnant seeming ideas.
Direct threats to violence though will likely not be protected as it would stifle free speech. But, saying that some speech could "maybe" or "potentially" lead to violence down the line is usually not an argument against allowing it.
Besides, it should ideally be a democratically elected civil government who decides these matters, not for profit private companies and its leaders.
