Sure, Alex Jones is a crackpot but why should you, or anyone for that matter, be allowed to prevent others from speaking to an audience that has decided to list

Sure, Alex Jones is a crackpot but why should you, or anyone for that matter, be allowed to prevent others from speaking to an audience that has decided to listen? What do you expect to happen when the balance of power, majority opinion, etc inevitably shifts and we find ourselves on the other side?