No, it is not in general. It is a fast way to share your opinion. If it is not abused, then there is no reason to think that this is something bad. It is the equivalent of making a comment with emoji of thumb/arrow down. If you will remove downvote button, people will just send similar comments.

I bet 10 dollars, that mod hasn't even send a message to that person asking what that was a thing.

Hmm... Okay, thanks for the info.

I see this thing for the first time. Interesting tool. But I think that this one is kinda wrong to exist? Aren't votes and downvotes supposed to be a mostly private and detectable only for admins?