Google manually adjusts its results for censorship reasons. This is probably why google has gotten so much worse, they don't want information to be freely accessible, they only want things they approve of to be seen.
I've always wondered why Sergey Brin and Larry Page retired when they did, it coincides almost exactly with the beginning of the SERP quality decline. Wonder what sort of conversation they had with intelligence to quietly walk to the door, cash out, and say nothing about the company since.