(Yes, this is a joke)
Techcrunch is influential and as such it is relevant for many people here. You can ban a site that is nasty and irrelevant, but you cannot ban a very relevant site just because some articles are odious.
Banning should not be about morals, but rather about usefulness.
Gawker, I can totally understand. Infochachkie, on the other hand, seems like a pretty decent site so I'm not quite sure why they were banned. Are there others which were banned that we don't know about? Were they banned for a good reason? Can your own site/blog/etc get banned in a similar way? What are the criteria? What should you avoid doing? etc.