I haven't downvoted yet. Still learning what to look out for and I don't want to get downvoted for doing it to the wrong one. Hopefully someone can build a tool that could show when a downvoter commented last or at least an automated script that when they downvote a repeated offender, it posts a link to what they have done. But at least some indication to what they have done. Maybe we could have a comment that is specifically with the downvote button that has the ability to post last comment or any of your saved downvote drafts. Where the comment only has access to downvote comments. With a few defaults to help people out.