@mwl @Corvan Legally, perhaps, but not morally. People often care about morals (and other things) more than they care about laws. If a law is in conflict with something they truly care about, they will be more likely to break the law. If a law can be used to support something they truly care about, they will be more likely to try and use it in its defence. That’s why you can’t expect people to be consistent in their treatment of any given law.

Moreover, copyleft wasn’t born out of appreciation of copyright, but rather the opposite. It shouldn’t be surprising if people who like copyleft dislike and disregard copyright in other context. It may seem counter-productive, since the former is legally dependent on the latter, but they are really different in spirit, and driven by different motivations.