Its not that hard to write the same article in 5 different ways. The author wrote it this way simply because they wanted to. People respond to tone, words, style, slang, crudeness, emphasis in different ways, and writing is an art form. I believe that diversity in writing styles is good.

>Also, if you see "polite" writing how would you know it's fake?

You develop your own detector after being "trained" on the dataset of prior comments.