The problem isn’t that Thompson is “a bit to the right.” Arguably, fascism and/or Nazism simply represent one particular strand of socialism – there is nothing “right-wing” about them.

The problem is that Thompson is inciting mob violence. That does not fall within the bounds of acceptable political speech in any civilized part of the world. And merely refraining from buying a ticket will not suffice to prevent others who do buy tickets from being led into wrongdoing.