If you're asking why I write One Direction fanfics even if I'm not a directioner, (but it's not as if anyone would ask) I just find writing 1D fanfics fun, actually. I could write other fanfics, but I guess what got me into writing One Direction fanfics is because I could create my own world.
My own set of characters and set of people. I found it difficult to capture the personality of some characters (in books and all) when I write other fanfics, so I decided to try writing about 1D. Since it's fanfiction, it revolves around them. And I guess I liked that. Because I don't have to become hectic in making 5 more characters with personalities to make a story.
I don't know, but that's just what I think. I mean, this is coming from someone who isn't really a directioner and all.