DEATH TO THE DENIERS

Here is a link to the article written by a professor. I understand he is an Australian living in Austria and his musings about how to treat leading "deniers" of the seriousness of global warming were put on his university website. Of course he should be treated as a deranged nutcase, but he is a professor and so some impressionable people will no doubt take notice of him. What if one person acts on his suggestion, will the prof. be held responsible?
UPDATE: The author has now removed the article entirely and posted an apology Post in haste, repent at leisure. Happy New Year everyone!