Suppose:
- You ask a questionquestion;
- Someone (well meaning though he may be) writes an answer which simply does not answer your question, but rather tells you what you should and shouldn't be doing.doing;
- The answer gets a significant (> 5) number of votes, and some positive comments.
Now when people look at the question, they see a high-vote answer and think the problem is solved. What can one do, other than a comment saying "that doesn't help me at all"? I can't downvote by more than 1, plus, that won't help since it's the only answer anyway, plus, downvoting is expensive.