Newzbin aren't the only ones. Look at thepiratebay, their arrogance was (and continues to be) staggering. Either these people believe that the law is other than it is, or they have a peculiar view of morality and a belief that the law will reflect their moral beliefs.
Of course there are a lot of people out there with a curious view of morality. For example there are those who think it's immoral that some of us go out to work and earn money to buy nice things and it is therefore moral for them to break steal that property. Some people are surprised to learn that many thieves do believe they are morally in the right even when they know they are legally in the wrong, but this is in fact the case.