I often ask questions which quote a sentence from NHK news. I had decided that it wasn't worth adding a link to NHK articles since they would expire in a month's time anyway. I thought that the only reason to do so would be to add more context (but shouldn't that be in the question anyway). But today someone suggested in the comments that I should have added a link.
So, what are peoples thoughts? When is it right to add a link, and for what reasons?