Is it ethical to fix grammatical and spelling errors in Internet reviews?

For now, the trend seems to be going in the opposite direction. By cleaning up its reviews, Zappos is hurting shoppers as it helps its bottom line. The lowercase reviews, the all-caps reviews, the Internet speak, the subject-verb-agreement manglings, the sentence fragments, the pathetic attempts to spell chic—all of these are factors to weigh when considering someone's opinion of low-top Chuck Taylors. Or, to be more earnest about it, our mistakes are what make us human. On the Internet, it's important that other people can tell if you're an idiot.