Because things like blogger and Google groups shouldn't require js to just view text. There is a large, large, enormously large body of work out there that doesn't need JavaScript to achieve its goal like showing text or images, but are more-or-leas broken without JavaScript. That's the tragedy. I don't expect a web app, such as Google maps or Google docs to work without js, but I should be able to read blogs and newsgroups.
That situation does not normally come up, because I stop trusting that site. If a page that just displays documents requires javascript to do so, then clearly the developers were not worthy of my trust.
There are legitimate uses of javascript, but I'm not going to enable it just to look at a document.