[paulitex]

> but I wasn't aware that there are "usual, legitimate" reasons for downvoting

Yup, there are. Here: http://ycombinator.com/newsguidelines.html

(A clear deviation of the guidelines deserves a downvote, a clear compliance does not. Like any law, there is a grey area in between requiring some amount of judgement. But these guidelines still stand to ground the discussion around what is/isn't a "usual, legitimate" reason for downvoting.)