I don't know about anyone else, but I'm already a super user. I don't need to be taught why things work the way they do, and I don't need to be taught how to fish. When I ask a question on SE, it's because I didn't previously know and currently can't find the answer. All I want is the answer. I'll upvote people who help me get the answer, just like I imagine people upvoted the cd - guy because he gave the answer without wasting their time.
I can guarantee you that somebody who thinks installing another OS might slow down his computer doesn't care what virtualization is. He just doesn't want a slow computer.
I agree with not upvoting crap, and I agree that some extra explaining can be useful in many cases. But several of your examples are just people giving a good straightforward answer where no extra stuff is needed or wanted, and I see absolutely nothing wrong with that.