Interesting reading. I've seen people do this - a *lot* of people. Something comes up, just click to get rid of it. If it was important, I'll find out later!
Real-life story, and no, I'm not going to say who did this. I'm watching over someone's shoulder as they browse the web. IE pops up a "This page is trying to change your homepage. Are you sure you want to do this?" with a URL like "www.instantcash.com" or something equally innocuous. They hit "yes" without reading it (I read fast, which was the only reason I saw it.) I don't say anything.
Few minutes later: "Why do I have this site as my home page?" "Well, um, you told it to." "No I didn't." "Yes you did. I watched you. You didn't read it, but it didn't know that."
This is a behavior that I've never understood. If you get an error, you understand it before moving on. You don't just get rid of it.
Don't even get me started on "Can you tell me what this error says?" people. It's in English. Read it. If you don't understand after that, I'll help, but when it says "Do you want to delete this file?" I got no sympathy.