I can remember that in the early days of the current comment system of Youtube, downvote button at comments had no effect unless you had a double-click on those.
Indeed, this prevented, let's say, "less intelligent", or at least, enraged and otherwise inexperienced users from mass downvoting.
On the other hand, I have doubts about whether it's fair. It's tricky and non-obvious, fooling users.
In general, what are the circumstances and factors that define, whether it's a good or a bad idea?