Anxiety of being an independent author

One of the questions someone asked was how does a person deal with negative reviews and how do they affect me. I was absolutely terrified of them initially and could set me in a state of anxiety for hours. Fortunately, I have received enough positive feedback that I can let them roll of my back fairly easily now. No one will ever please everyone. I am sure some people gave even Harry Potter horrible reviews.

The ones that concern us independents are these http://www.amazon.com/The-Sorcerers-R...

There is no constructive opinion or feedback to go with the 1 star. Why was it horrible? Was there nothing redeemable about the book? One star can lower the overall rating, lessen Amazon recommendations, and destroy sales. There are companies out there who are paid to post bad reviews to intentionally destroy writers' rankings and people who pay them to do so. Is this one of them? I don't know. I do not understand why someone would think that by destroying one author their readers are going to flock to their books. I pray that the intelligence of the reading public is great enough to spot the trolls or just an individually dissatisfied customer and base their opinion and purchase choices on the overall quality of the book and its reviews and not just a few people who do not take the time to give a fair review, either positive or negative, or someone who just wants to intentionally hurt someone they don't even know.

Take this review for example. http://www.amazon.com/The-Sorcerers-R...

Correct me if I am wrong, but I do not recall making any reference to orphans, there were few battles and none were huge nor were they described in any sort of gory detail.  The vagueness of the review makes me think everything was taken from the book description and not actually read. Like the 1 star review, this person only has 1 other review on Amazon. If it is a legitimately dissatisfied reader then I am fine with that. I doubt I will ever be totally satisfied with anything I write. I just hope we aren't becoming such a competitive and spiteful society that we go out of our way to hurt people because we can safely hide behind the anonymity of the internet.