Writer's Fallout Shelter

Convince me of your point of view.

Geez, whaddya think I've been trying to do?

*sigh* alright. Let's say hypothetically that there was a story (Which I may or may not decide to work on myself. I like the idea, but I'm pretty capricious.) about someone who believes absolutely in the power of humanity. He/she (these are bad choices, by the way. Either he/she, which is bad, or they, which is plural. Ugh) is, for example, an athiest because he/she doesn't like the idea of dependance on something else. He/she is apart of some cause, like feeding third world children or the like, although it could fit in just about any genre, so this isn't really limited at all. It isn't going well, for whatever reason-loss of funds, counter-organizations, ect. but the main character keeps insisting that they only need to keep at it because people are, given the drive, capable of anything. It gets worse and worse, and the main character keeps working harder and harder. Finally, when things look bleakest, some random disaster comes along and, somehow, solves all his/her problems, and would have solved the problems even if the main character hadn't done anhything.

Now, this is obviously very rough, but it has promise, and works because of, and not in spite of, the DeM ending, which creates potentially interesting ideas and situations. There are probably more, even better ideas out there that haven't been explored simply because people dismiss DeM out of hand.

If they're after humor, it's probably not really a DeM ending.
Why not?