>I worry that Stallman is ignoring arguments that may inform his own, or even change them.
Of course he is! It is called confirmation bias. It is very very strong, especially with people like Stallman who hold strong beliefs. We are all guilty of it to some extent.
Here's some reading:
http://en.wikipedia.org/wiki/Confirmation_bias
http://youarenotsosmart.com/2010/06/23/confirmation-bias/
http://socialpsychologyeye.wordpress.com/2011/04/22/confirma...
Confirmation bias (also called confirmatory bias or myside bias) is a tendency of people to favor information that confirms their beliefs or hypotheses.[Note 1][1] People display this bias when they gather or remember information selectively, or when they interpret it in a biased way. The effect is stronger for emotionally charged issues and for deeply entrenched beliefs. They also tend to interpret ambiguous evidence as supporting their existing position. Biased search, interpretation and memory have been invoked to explain attitude polarization (when a disagreement becomes more extreme even though the different parties are exposed to the same evidence), belief perseverance (when beliefs persist after the evidence for them is shown to be false), the irrational primacy effect (a greater reliance on information encountered early in a series) and illusory correlation (when people falsely perceive an association between two events or situations).
A series of experiments in the 1960s suggested that people are biased toward confirming their existing beliefs. Later work re-interpreted these results as a tendency to test ideas in a one-sided way, focusing on one possibility and ignoring alternatives. In certain situations, this tendency can bias people's conclusions. Explanations for the observed biases include wishful thinking and the limited human capacity to process information. Another explanation is that people show confirmation bias because they are weighing up the costs of being wrong, rather than investigating in a neutral, scientific way.
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The most interesting is the last link. They did a study about the show The Colbert Report, which is satire, He plays a parody of conservative political pundits. The study looked at the viewer's political beliefs and what they thought of Colbert's.
"More liberal participants believed Colbert was liberal and that the show was satirical. More conservative participants believed Colbert was conservative and genuinely believed his “satirical” arguments. Essentially, viewers of liberal and conservative orientations tended to perceive Colbert as supporting whatever views they personally held."
