Yeah, I know exactly what you mean and I totally agree. When speaking of nature, most people think of things like beautiful landscapes or majestic animals. But nature is much more, it doesn't know moral, it's primitive and cruel. In your own words: Nature wants to you be a rapist and murder. And this actually what survival of the fittest is about, not more or less. The strongest, cruelest, most cunning and most egoistic species have the best chance to survive and reproduce.