Writing is a mirror to who you are and what you believe in. Every story has a little bit of the author in it. We write what we know about, and the one thing almost everyone knows about is he or she (yes, that's proper grammar, not 'themselves' That would be improper pronoun-antecedent agreement.
Ha, like I know what I'm talking about. I'm just an unpublished writer ^_^ Nah, I kid. No, I'm not in denial.