Could it be that the body's original designer (The Good Lord) knew what he was doing when he created human life, including the appendix?!
I think it's more likely an organ leftover from a few steps earlier in evolution, ya know like back when we used to eat raw meat? In think its our super sanitary world that has diminished its purpose, who knows maybe back then there was less of a risk of the appendix becoming infected as well. In my opinion I don't think the cleanliness of our food is on the top of our bodies priority list.