So it doesn't really surprise me.
The world is global now, and it's impossible to be a part of a fandom if you cant access the content.
Case in point: HarmonQuest[0]. It was on some really weird tiny channels in US and Canada, neither allowed anyone from outside of NA to even give them money to see it. -> Yarr.
It’s not a strange position, infact, I would say going on a hacker board and moralizing is a strange position. Hackers just want information to be free.
Many of the others have posted some good explanations that tie the pro-piracy people to the idea that information wants to be free. In other words, asking people to pay is somehow kind of equivalent to censorship.
It's worth noting that the pro-piracy vibe is only for pirating the work of writers, musicians or movie makers. Not pirating software. If someone suggests simply stealing someone else's code -- or even just ignoring an open source license -- people jump all over that person. The programmers stick together. But the artists are in another tribe so it's okay to rip them off.
If there's no copyright, anyone can steal your employer's code and then your employer won't have money to pay you by the hour.
Data on the other hand, is far less risky, as malicious content would need to exploit the file format parser, etc which is much harder than Trojan using a binary. You probably are not getting malware from mp3s.
It's not that strange for folks who consider the value of even significant chunks of code or distributed software to be close to zero. Combine that with the lack of value of copy protection at its significant and it makes total sense why developers may have a weak stance on piracy.
I think at the end of the day people just don't care.