The war on Chametz is symbolic of our war on idolatry both today and specifically in the context of what happened to the Jews in Egypt. To top it all off, leaven turns out to be one of the great inventions of the Egyptians. It is emblematic of the Egyptian culture. That's nice, a war on idolatry. Well, I'll just go out and knock down all those idols out there.
Idolatry is the worship of self.
A man takes some clay and fashions it using his own skills. I think I'll worship it. It is my god. My work is my god. I am my own god.