Jack the Potato said:
Social Darwinism, for those who don't know, is the application of Darwin's "survival of the fittest" idea to everyday life. It's not a common label today because its ideas basically spawned countless atrocious and bigoted movements, including Nazism, but I see its principles applied EVERYWHERE, and every time I do, I can only ask "why?"
Because the basic of Evolution by Natural Selection are pretty profuse throughout everyday life, even if it's not explicitly made to imitate it.
First off, there's the fact that "survival of the fittest" applies to entire species, NOT individuals. If one species of mouse is more able to hide from owls, that species is more likely to live and thrive than the others. That's it. That's the entire principle.
Well, no, you got that wrong.
Natural Selection acts on individuals in a population, selecting for traits which allow the better exploitation of resources from the environment and an increase in fecundity. Over time this can result in new species, but Natural Selection
only acts on individuals.
Yet people use survival of the fittest quite often as an excuse to be an asshole. They use it to justify taking advantage of those less fortunate ("I worked hard to be rich, obviously the poor haven't worked as hard as I did or they'd be rich too! Survival of the fittest!"), to justify doing downright dirty things to "win" ("I could have told Steve they bumped up the due date of the project so he wouldn't get fired, but now I'm getting his office! Survival of the fittest!") or just to be a bully ("Hey, if this nerd spent less time on his computer and more time at the gym, I wouldn't be able to shove him in his locker every day! Survival of the fittest!"). And of course, whenever someone says that, people often find it difficult to come up with a good counterpoint.
Assholes don't need an excuse to be assholes. That's why they're assholes. If they had a good excuse, you'd be able to understand their actions.
These people couldn't be more wrong if their feet grew out of their head! Going back to my species example, if one species of owl is much more adapt at cooperating with each other to catch delicious mice, that species is more likely to live and thrive than the others.
Unfortunately your example was the product of an incorrect understanding.
Cooperation. Teamwork. Kindness. Peace. These things will allow a species a much greater chance at surviving than any brutal, dirty, or cowardly method.
Not necessarily. If resources can only support 3 of a species, 4 working together still results in the death of one, and may result in the death of the others depending on how they divided the resources.
You're not thinking in Evolutionary terms. The more resources you can horde for yourself, with a few exceptions, the better because it allows you to have more offspring (and pass your successful genes on more so than others).
Unless it increases your Fitness (that is, the number of surviving offspring you produce), it's not going to be favored. Teamwork is great - up until another male impregnates a female you could have, reducing your fitness. Cooperation is fantastic - until there's only enough food for one of you. Peace, as the ceasing of violent behaviors, will simply never happen as long as resources are finite.
Don't get me wrong either, humans are actually VERY good at these things, at least inside their own social groups. I just can't stand it when assholes pervert the most basic idea in nature and act like being nice makes you a "freak of nature." The only freaks of nature here are people who don't understand that we'll always achieve more working together than any individual, no matter how "fit," could.
Nature doesn't really care what we "achieve." It cares what survives to reproduce. To humans, Mother Teresa (sp?) was a wonderful person who took great burdens upon herself to help the needy and unfortunate. A true testament to human willpower and our capability for kindness.
To Evolution she had a fitness of 0. She didn't have any kids, so if her kindness was in any way genetic, it's now gone.
So to those on this site who may find themselves, even only occasionally, thinking that survival of the fittest is an appropriate line of thought when dealing with things in your life, I humbly ask you to take a step back and reevaluate that.
You need to have a much better working knowledge of that, first.

Your definition is flawed, and nothing is as simple as you make it seem here.