Wow. This is so deep and fathomless. I love how you entwine different metaphors to finally reveal at the end that every person has a dark side, a villain, lurking deep inside of him or herself, and he or she can not destroy it if he or she does not know about it.

I think this poem is saying that the passion of humanity itself will eventually be the inevitable end to humanity.

Hmm.. I like it, especially the last line.