Prescriptive grammars exits to teach poor people (or immigrants) how to speak and write like rich people. Rules are easier to teach and learn than an essentially unlimited number of examples. Some people say this is good - it makes it harder to discriminate against poor people. Some people say it is bad, because it reinforces the idea that poor people speak in an uneducated way.
Let's be frank - neither side can be trusted. They aren't interested in quantitative arguments, or logic, or a rigorous historical study. They'll just line up a bunch of emotive arguments, and then claim that their side rings true (because to them, it does).
Of course. "Let the use of words teach you their meaning," and so on. But when it comes to names, all bets are off. Names are a special case; prescription still holds sway over them. At least, I think most people would agree that you (the indefinite you) aren't wrong to correct someone who mispronounces your name. To varying extents, this is true also of the names of things.
Join me. The more we are, the more Right we become.