Reddit/HN create one interaction with the comment(upvote/downvote) and then expect that they must use this button to make the post more prominent or less promin

Reddit/HN create one interaction with the comment(upvote/downvote) and then expect that they must use this button to make the post more prominent or less prominent, even though the most strong emotional reaction is agreeing/disagreeing. Its like you invite people to a debate, where you say "please only boo when someone is saying something obscene and nasty or breaking the rules of the debate, not when they are saying something you disagree with".