This is precisely my reason for why they should be public.
In my view downvotes should be used sparingly, only to suppress spam and trolling comments that don’t add to the conversation.
By keeping votes private people just downvote anything they disagree with
You have no reason to so I presume you haven’t.
If we were actually in a discussion and you started downvoting all my comments I’d see it as a sign of pettiness and disengage.
I’d probably also tag you as a reminder to myself not to engage with you again.