I don't know the original basis of this style, but it's a fact that it is the style presently used on Wikipedia. One problem is that at least some of these are only proper nouns when applied as a specific title rather than generic noun itself, for example, "As of this month, Congressman Smith is the congressman who represents my home town." Again, I'm not agreeing or disagreeing with specific usages, merely noting how this are done at this time. I see on your talk-page that another editor has already told you a good place to discuss it with a group of WP editors who deal in this area.