Edit: obligatory explanation (thanks mods for squaring me away)…
What you see via the UI isn’t “all that exists”. Unlike Reddit, where everything is a black box, there are a lot more eyeballs who can see “under the hood”. Any instance admin, proper or rogue, gets a ton of information that users won’t normally see. The attached example demonstrates that while users will only see upvote/downvote tallies, admins can see who actually performed those actions.
Edit: To clarify, not just YOUR instance admin gets this info. This is ANY instance admin across the Fediverse.
And yet, that was not due to the likes and dislikes being visible but your comment. I still don’t see the difference in potential of harassment due to likes being visible versus comments.
I have a 7 year old Reddit account with 38k karma and I was never pursued or harrassed by anyone (a part from some heated exchanges in comments which I abandoned once I grew tired of them).
The issue is that I often don’t want to comment and engage with some of the psychos that show up on the internet. Downvotes are a passive way to help move hateful/ignorant comments to the bottom of the thread. Having downvotes publicly accessible is giving these psychos a way to directly engage back with you.