I've sometimes wondered about the answers I give when people ask me why I do the things I do. Typically I answer "It's what I do." or "Because I can."
Why do I do the things I do? Why do I risk my neck for little to no reward? Would I be happier just taking care of my own and the hell with the rest? I started the ball rolling, now let the rest of them take charge of keeping it on?
Maybe. But I doubt it.
When I look at the second answer, it's probably the more honest of the two. I do what I do because I can. I am physically capable and mentally prepared to do battle against that which threatens me and which threatens you. I have fought and killed and survived to make sure you do to. I am capable of dealing with the threat therefore I have a duty to deal with it.
Charlie and I had this conversation on a regular basis. He said the zombies brought out the true nature of ourselves. If we were craven cowards under the surface, but never admitted it to ourselves or anyone else, the zombies sure as hell got us on the truth train. Likewise, if we were calm under fire, and threw ourselves into harm's way to rescue our own, the zombies revealed that as well.
The bottom line is I am capable of making a difference, therefore I have a responsibility to do so.
The other answer is probably more simplistic. I think, therefore I am. I fight zombies, therefore I kill zombies. It's just the job I happen to have at the moment.
Sarah says its the answer I give when I can't think of anything clever or better to say. She's probably right.