The real training is objectivity, which is very difficult for even doctors to maintain, despite knowing just how misleading research results can be and so how they must be wary, how to rationally follow the literature, etc.
I seriously doubt more than single-digit percentages of people googling things, even intelligently, are going to be following citations and weighing competing models. Likely less than a fraction of one percent. And, unless they have personally done similar research and so can understand the data and potential pitfalls more clearly, even that enlightened fraction is highly likely to make some biased misinterpretation.
How can they not, when it is their own health they are investigating? Even a genius layperson examining the literature flawlessly would benefit from an interpretation provided by a neutral third party.