As someone who has experienced depression, hearing that other people are unhappy doesn't help me at all or make me feel sympathetic. Having someone simply offer to help or care is what I am honestly hoping for when I'm feeling down.

This may not generalize well, but when I'm feeling down, I still have some sense that things could be better, and might be better again, and emphasizing that, and that people are around to pull me up from the bottom until they do, is valuable for me.