Rhoi gwaed

At the risk of being controversial...

Just got back from giving blood.  This is something I have been doing on a regular basis for a long time.  Now the main purpose in giving blood is to help other people to live.  I also happen to believe that many of the problems facing the world today are ultimately due to the exponential population growth the world has experienced and that in the long run (if not the short run as well) the world would be a better place with many fewer people.  So should I keep giving blood?