Should we stop writing when we're sad?

No. Like you said "It doesn't matter to whom we write, or whether someone will ever appreciate it."

I guess it's a lot easier to write and share about good things, when we are happy and satisfied. When we are sad or going through a rough time, it's not that easy to open up to people, expose ourselves and our vulnerability to the world.

But honest writing, no matter if shared on Steemit or not, it can be healing and helpful, at least in my case.

By the way, I just remembered the first poem of yours I've ever read, it was about a rose and I loved it even though you said it might be "dark" or somethings like that, but those "dark" poems are my favorite to read from you. :)