@browncoat - In some cases it wasn't actually a person and I think that's probably true of a lot of really bad technical writing. First, you have the cases where instructions or some other kind of technical writing are translated with bad translation software (or any kind really, since I'm not sure there are good kinds of translation software).
And then you have those books that seem to be filling the internet that are made by people creating a computer algorithm to search the internet for a particular subject and then put it together into a text. Since they will cull sections from large articles, the words are often disjointed and don't make sense in a paragraph.
I've heard people complain about how expensive a professional technical writer can be, but there's a reason for that. It's actually quite hard work and it takes a skilled person to do it.