Why is it so hard to outrank some negative Google search results?

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Google Search Result-Optimization is More Like A Horse Race that Never Ends

Lots of people erroneously think that high ranking in Google is like a ladder, but it is much more like a horse race that goes on forever; Really, it never ends. Each time you look at Google search for a specific query it is simply a snapshot of how the horses are placed at that moment in time, but not necessarily the distance between each horse.