For example, suppose I want someone to think that making use of human biases is a bad thing, and so I label that activity using words with negatively weighted denotations like "exploit" and "dark."

What have I made worse, by so doing?

Now that was well done. Although technically you would have counter-factually made the universe worse according to your values. You will have lost a small measure of respect from your audience and by so doing reduced your social influence - a critical instrumental resource. Even worse your credibility will have decreased most specifically when it comes to moral authority.