Moderation is Not Censorship

Sometimes, you have to keep the discussion on track and not bring in distracting items.  In this case, I am referring to PopularScience.com's decision to stop taking comments.

It wasn't a decision we made lightly. As the news arm of a 141-year-old science and technology magazine, we are as committed to fostering lively, intellectual debate as we are to spreading the word of science far and wide. The problem is when trolls and spambots overwhelm the former, diminishing our ability to do the latter.

Some people want to cut short rational discussion.  There is the 50 Cent Party and it's right wing US equivalent that sees the words "Second Amendment" and comes to argue gun rights--even if its a second amendment to a community dog park proposal in Effing Sodbury. 
Anyway, the Popular Science post pointed out that:

But even a fractious minority wields enough power to skew a reader's perception of a story, recent research suggests. In one study led by University of Wisconsin-Madison professor Dominique Brossard, 1,183 Americans read a fake blog post on nanotechnology and revealed in survey questions how they felt about the subject (are they wary of the benefits or supportive?). Then, through a randomly assigned condition, they read either epithet- and insult-laden comments ("If you don't see the benefits of using nanotechnology in these kinds of products, you're an idiot" ) or civil comments. The results, as Brossard and coauthor Dietram A. Scheufele wrote in a New York Times op-ed:
Uncivil comments not only polarized readers, but they often changed a participant's interpretation of the news story itself. In the civil group, those who initially did or did not support the technology — whom we identified with preliminary survey questions — continued to feel the same way after reading the comments. Those exposed to rude comments, however, ended up with a much more polarized understanding of the risks connected with the technology. Simply including an ad hominem attack in a reader comment was enough to make study participants think the downside of the reported technology was greater than they'd previously thought.
Another, similarly designed study found that even just firmly worded (but not uncivil) disagreements between commenters impacted readers' perception of science.
If you carry out those results to their logical end--commenters shape public opinion; public opinion shapes public policy; public policy shapes how and whether and what research gets funded--you start to see why we feel compelled to hit the "off" switch.
A politically motivated, decades-long war on expertise has eroded the popular consensus on a wide variety of scientifically validated topics. Everything, from evolution to the origins of climate change, is mistakenly up for grabs again. Scientific certainty is just another thing for two people to "debate" on television. And because comments sections tend to be a grotesque reflection of the media culture surrounding them, the cynical work of undermining bedrock scientific doctrine is now being done beneath our own stories, within a website devoted to championing science.

Reading comment threads on the web, two patterns jump out at me. The first is that discussions of issues in which there’s little money at stake tend to be a lot more civilised than debates about issues where companies stand to lose or gain billions: such as climate change, public health and corporate tax avoidance. These are often characterised by amazing levels of abuse and disruption.
Articles about the environment and gun control are hit harder by such tactics than any others. I love debate, and I often wade into the threads beneath my columns. But it’s a depressing experience, as instead of contesting the issues I raise, many of those who disagree bombard the opposition with infantile abuse, or just keep repeating a fiction, however often it has been discredited. This ensures that an intelligent discussion is almost impossible – which appears to be the point.
The second pattern is the strong association between this tactic and a certain set of views: pro-corporate, anti-tax, anti-regulation. Both traditional conservatives and traditional progressives tend be more willing to discuss an issue than these right-wing libertarians, many of whom seek instead to shut down debate.
The problem is that this is a matter of public safety, which now that the science has been unleashed will show that it has been guided by fiction and fantasy.  That is not the proper way to run a public policy debate.
Now, I know that the usual suspects will complain, but it has to be said.