Well, there are different kinds of atheists because atheists also have positive worldviews. For instance, recently I've been arguing against scientism, such as Neil deGrasse Tyson's dismissal of the philosophy of science. But Tyson's an atheist too.
All religious folks might benefit to some degree, compared to atheists, when it comes to finding comforts to counteract existential fears.
There are at least two benefits of writing atheistic arguments that won't change anyone's mind. First, they clarify why we believe what we believe, so they add to self-knowledge. Second, they satisfy the author (the therapeutic aspect of all art).
Also, as I pointed out in the article, there are the cases in which these writings might act as catalysts, pushing over the edge someone who's between theism and atheism.