Maybe I’m missing something here. There are two apostrophes in the third sentence. Which one are you referring to? I did well in English in school but maybe something has changed regarding the possessive rules and the use of apostrophes since I graduated almost 50 years ago.
Anyone can and does make typos and spelling errors on the internet, even publications. I see it all the time. I make them myself sometimes even after proof reading my typing. I catch typographical or spelling errors in published hardback books on occasion too. But that doesn’t automatically void the content of a book or article or comments or posts just because you happen to catch an error. It certainly doesn’t necessarily make the authors complete idiots either.
I think you doth project too much.
On the other hand, 100% of those reading the article on Free Republic know both that Detroit is a hell-hole and that the judge is an idiot, and none of us can do anything about these things. A good number of those reading could improve in their apostrophe use, so perhaps the tangent is not so bad.
My favourite hijacked thread was one a few years ago that devolved into a discussion on lost socks and washing machines.