Hence what's wrong with our education system. 'Joe the Plumber' was an appeal to emotion, not to authority; but Heron obviously just saw a box to check and so he did.
Joe the plumber was none of the above. He was an evidentiary example. A data point. The principal potential fallacy is a fallacy of composition,the assumption that Joe the plumber is a representative member of a larger class of individuals who would be so injured. But demonstrating that it is a fallacy requires demonstrating that others would not be so injured.