If I had any tendency to downvote content I find disgusting enough to do that, I would not mind at all who could see that I did. On the last similar site I joined and participated on, downvotes were anonymous for quite a while. When the administrators of that site presented their consideration of allowing members to see who downvoted their content, there was a great uproar from a lot users...about "betrayal" and such. Many 'members' expressing outrage, had rarely or seldom seen usernames.
When the current and past downvotes did become no longer "anonymous", it was clear to see to why some were outraged at the idea. It was illuminating to see and know how very petty they were...downvoting songs and other innocuous comments and replies, just for spite.