The reasons I believe are much different to that.
Newzbin I assume are actually setting out to provide a service that at least in part provides indexes to copyright material. If the copyright holder asked them to remove these links then would they? If they wouldn't then they are an accessory to copyright theft.
Good point, on that front Newzbin state that they have never been contacted by the MPA. Its easy to believe either party either way to be honest. Newzbin has a facility to ask for an index to be removed if you are the copyright holder so the facilities exist, whether MPA has used them is another matter. So its whether they did ask but got ignored, I don't believe they've stated in any of their court claims they've asked for removal and it has been ignored? So I'd suggest they've never tried.
Usenet (one of many hosting servers that host the actual content which Newzbin mearly trawls and indexes) does comply with DMCA requests, so the question is why is the MPA doing for a branch of the tree and not one of its roots?
Google are primarily a search engine of everything on the net (at least that isn't protected against search crawlers in some way). Some of this is copyright and if asked to take it down they will.
Yep I've seen that myself but there's a lot more to take down the MPA should get cracking!
So, google work within the law and copyright whereas Newzbin have stated that they will break the censorship system that has been ordered by a legal process and therefore are working outside of the law.
Well not really that's a bit of naughty journalism to be honest (is there another type?) they've not said they'll break anything, the way its reported on the BBC site and others suggests they'll attack Cleanfeed. They've mearly said that the way that Cleanfeed will block them will be irrelevant as there are existing tools on the net people can use to still access their site.