Evolution is a simple law. You either reproduce or you don't. And whatever caused you to die before reproducing will be rarer in future generations...
It might be just my bruttal and empathy-absent curiosity, but seing this simle algorythm at work even with such an amazing life-altering change as chemically mutulating your own body makes me so excited.
A simple algorithm. One rule. But there is no way to stop it :D