I recently learned that voting on lemmy is not anonymous. Anyone can get information about who has upvoted and downvoted a post or comment.
In combination with your IP, this is a massive privacy (maybe even physical security) risk. Also, people can target you for your votes.
Sadly, this is something where I would prefer Reddit over Lemmy. Big tech scrapes data from both places anyways, at least Reddit is safe.
Disagreements are more important than agreements, otherwise it just forms echo chambers
You can disagree without a downvote option.
It’s more constructive to formulate a response for disagreement anyway.