Only thumbs up?
I am reminded of the saying "If you can't say something positive, don't say anything at all". Would it improve the DL culture if we could only "vote up" or not vote at all in the discussion section?
We don't live in a fairy tale. Negative points are as useful as positive ones.
They aren't saying anything, just showing that they disagree with someone or something.
I agree with Dessamator. If you get a negative point, don't feel bad. Take it like this: You are learning something new, every time you get a thumbs down! You realize your mistake, or someone just doesn't agree with you. Its that simple.