"I assume you are a Darwinist, and have no moral foundation, so you should be rejoicing over this, survival of the fittest in action."  AT:  I fear you confuse biological evolution with "Social Darwinism".  They are very different things.  "Social Darwinists held that the life of humans in society was a struggle for existence ruled by “survival of the fittest,” a phrase proposed by the British philosopher and scientist Herbert Spencer. Herbert Spencer."  Being, as you put it, "a Darwinist" has NOTHING to do with applying the concepts of evolution to justify a society where the "fittest"...meaning most powerful......rule.  The "success" of those who perpetrate sexual violence is founded on their power over their victims.  

I think you will likely find that many, if not most, individuals who support the Theory of Evolution are also very much opposed to Social Darwinism.  It's a reflection of their very sound "moral foundation" to reject that the powerful should victimize others.  GCrum