I know what you said - it's short-sighted. Nature imposes limitations. Whether you choose to call them limitations or not doesn't change simple reality, just as a retard is a retard whether he prefers to be be called retard, moron, idiot, mentally handicapped, or differently abled. Gravity keeps you from floating off into sapce. Your body requires oxygen to function longer than a few minutes. Your eyes require time to adjust when going between dark and bright areas. These are limitations, and they are real.
Human nature: birth, eat, breathe, shit, fuck, die. Anything else is a social decision. This includes the emergence of concepts such as freedom. The idea that "taking" someone's freedom (which is impossible anyway, or there never would have been any rebellions) makes him something less than a human being is ludicrous - a human being according to your personal standards, maybe, but from an objective standpoint, it's a human being so long as the genes match. You might want to consider formulating a demarcation between the world as it is, and the world as you want it to be. There's obviously a difference between the two.
Finally, I don't hate my contemporaries... I do think a lot of people are idiotic, and it's a shame that unrestricted breeding has made them so, but that's no reason for me to despair about it. If anything, they provide me with a source of amusement while I tend to more important things than complaining about the state of the world.