While I think the basic aspect of holdinng a newspaper accountable for outright lies or reporting so irresponsible it is virtually indistinguishable from a lie is a Godd Thing, this particular action brings up some much less cut and dried issues such as holding the paper accountable for anonymous commenters and the paper accountable for article reposts.
Given the escalation of personal attacks and irresponsible journalism, such libel cases need to be pursued. This Huffington Post article describes just how serious the climate of climate science has become:
One symptom of this shift is the ongoing campaign of cyber-bullying
directed at climate scientists themselves. Any climate scientist in
the news now receives a torrent of aggressive and abusive emails. As
Stanford’s prominent climatologist Stephen Schneider says: “It’s ugly
death threat stuff; ‘You belong in jail,’ ‘You should be executed.’
[This] never happened… a year ago. [But] now it’s off the charts.”
The climate change deniers efforts to intimidate is not confined to
verbal threats. Schneider reports that climatologist Ben Santer found
a shredded animal on his doorstep late one night after someone rang
Targeting individuals at their residences is a strong indication that
the intimidation campaign is determined and well-orchestrated.
Internet sites like Climate Depot focus the efforts of an emerging
army of aggressive bloggers
I don’t recall any such incidents where a prominent denialist was on the receiving end of such a vile gesture.