I think the problem is with “what matters.” That is assigning a drive and reason which don’t really exist. There are plenty of instances of predator and prey populations growing and crashing to indicate that there is no short term mechanism preventing overpopulation in all cases. Certain species might randomly develop such and it might be successful in the long term, but evolution mostly cooks up new ways of dealing with life and seeing which ones work in both the short and long terms.
There are no prizes in evolution, not beyond your own survival itself, and whatever pleasure (including, but not limited to, sexual pleasure) you might get while you are alive. You are not going to be rewarded if your genes survive, or, come to that, be punished if they don’t. Your mistake, Jragon, is to try to apply what are the essentially social/ethical concepts of winning and losing onto a process, evolution, that is not a product of society, and does not have an ethical dimension.