Unfortunately, "Do No Evil" does not include, "Don't Be A Dick."
Google has killed 15-20 years worth of information that's not only of interest for it's history, but for the still useful conversations on damned near any topic you can think of.
Ok, so not everything is still useful. I can't argue that since there were plenty of sports and entertainment groups, but there were also many groups whose information doesn't really become stale. In hiding this data, Google has fucked over anyone who might have benefited from finding it.
Hell, the very damned first time I ever heard of Google was an announcement on USENET. I thought they were pretty slick then and I started using Google instead of DogPile(? I think it was dogpile. That was a long time ago.).