Why?

For the last week and a half now, I've been digging up academic journal articles, and copying book excerpts that primarily deal with Joseph Campbell and Aristotle's Poetics in preparation to write a book (or something) that criticizes screenwriting books and their dogmatic views on storytelling. Earlier tonight, I believe I was thinking about digging out more articles at the libraries at Cornell, when I had to stop and think.

WHY AM I DOING THIS?!?!?? It's not that pursuing such a project would be futile (though it might be). My question was more like, "Do I really care enough to do this?" Undertaking a book length criticism requires a lot of energy, and I might be better off channeling that energy in more constructive ways. I don't even have a proper thesis! Why do I want to do this, and why do I care?