I guess the guys going with "No,it's against natural selection" and "Bad luck for the vitims, overpopulation" were never life-threatening sick. Saying such things while you are sitting in your comfortable room and are healthy is incredibly arrogant.
Get cancer and then tell me its ok that you die because it happens according to natural selection. Ignorant kids...
Everybody deserves to live. Overpopulation, famines etc, are a lame excuse. With a change of life styles this wouldn't be a problem(even today we're producing enough food to ensure the wellbeing of all humans,it's just not equally distributed.) Western societies dump as much food (like bread that's older than one day) as a good part of the thirld world needs...
And birth rates lower when the standard of living rises. Look at first and second world countries. In Japan and parts of western europe some analysts even fear that the population of these countries will shrinkin the next years from low birth rates. Give humans education, jobs and chances and you don't have to fear overpopulation!