We are not improving as a species regarding qualities like kindness, generosity, peacefulness, empathy, etc. To whatever degree we as a species possessed those qualities, and their opposites, 200,000 years ago we still possess them to the same degree today. Evolution doesn't work that fast.
Any improvements that we as a species appear to have demonstrated are actually societal and cultural improvements that result from increasing wealth. The more wealthy a society, the more generous it can afford to be.
I would concur that first world societies actually help mitigate those 'animal urges' to a degree. For a first world society to function, there has to be a fair level of empathy and altruism that exists. Otherwise, the society would collapse.
With that being said, if we get to a Lord of the Flies type scenario where we are starting to compete for rapidly dwindling resources, then our baser instincts of survival will start to manifest.
As Phat alluded to, we have to start to be honest about the size of our population and the ultimate carrying capacity of our planet. Technology and movement into the first world will also help. But ironically, we will be dealing with other problems if the population peaks and then starts to decline. While that likely will be good from an environmental perspective, it is going to have economic consequences because many of the systems in place currently were designed with an increasing or static population in mind. Social security, medicare, and so forth could start to run into problems with declining populations since they are designed to utilize current funds to pay for previous generations. So that will result in strains on the systems. Also, our economy itself is driven by growth and revenue and that could start to hit the skids with a population peak or a population decline. We could start seeing deflation manifest and asset prices in things like housing begin a downward spiral. Mind you I see this as more of an issue for countries that do not have good immigration policies or are not considered 'desirable' from a migration perspective. Like Japan, China and India.