This is not about the language police, it's about logic. The phrase "beg the question" has a specific meaning in logic, just as 1+1=2 in math, and it describes a logical fallacy which assumes an answer that has not been agreed upon. In logic, fallacies are defined specifically to identify and distinguish intellectually dishonest arguments. To misuse a logical definition and commit a logical fallacy in the context of attempting to make a logical argument is certainly worth pointing out to a wider audience and I applaud the original poster for catching this.