To be fair, there's a point to be made that someone who's overly trigger-happy on dislike should be shamed for it. Just like you would be if you kept being snide to everyone in real life.
I agree that transparency would do much more good than harm, plus compared to the info that people already put in their profiles/comments, it's not likely to make them anymore identifiable.
Yeah. If you're on a public forum accessible to anyone, which the whole fediverse is, then you should never assume privacy.
Honestly transparency in this regard would be better - they're already visible to much of the community, so they might as well be visible to everyone.