Earlier quoted context omitted.
Is it cognitive dissonance, or simply different people commenting? HN is not a hive mind.
Can't say for sure, just the feeling I get. HN comments usually seem pre-dominantly pro or anti copyright depending on context (e.g. "big company fails to comply with GPL" would result in mainly pro copyright comments while "bittorrent site gets shut down" would mainly result in anti copyright ones).
I wouldn't use the GPL as a copyrights poster-boy since it subverts the 'normal' use of copyrights (restriction of distribution by 3rd parties) - the FSF calls it 'copyleft' for that very reason. My feeling is that being pro-GPL and being pro-bittorrent is consistent with the "information wants to be free" mindset - no cognitive dissonance necessary. The day HN becomes pro-Mickey-Mouse laws then you would have an argument.