"Love" doesn't make us less animals, "love" is our way to go with procreation.
What makes difference between us and most other animals is the so called "self-controll", which I don't see that you have when you pop out 3 or more kids.
The social environment isn't really about "surival of the fittest" which I think evolution atleast was about. If procreation used to be to survive, it sure as hell ain't so now. Now it's more "get kids so you can get food stamps and social welfare". Ah, now I see what you mean with social environment.
http://en.wikipedia.org/wiki/Idiocracy