"Piling on" downvoting of someone who was sincerely answering a question is not nice. Think the answer is wrong or unhelpful or something? Vote it to 0 or -1 and leave it at that. Or don't bother...
If the sincere question would have taken two seconds to type "DHH" into Google to answer, then down-voting is fair game.
I think the question should be downvoted because anyone who's got a web browser to visit HN also has Google and a web search widget just a click away. And Mr. Rails/37Signals is the top result for a search on DHH. Downvoting paolo's attempt at an answer is not cool, however. Or least, it's less understandable.