I see diseases as people either having to suffer through or die due to a terrible cause. A disease is not a natural process of death; it is a terrible reason for the person to die. My grandpa up until he was diagnosed with cancer at age 73 was a very active person. Then he had to start his treatmeant and for the past 3 years his life has been terrible. He probably doesn't have a whole lot of time life because of the disease he has. Now if he hadn't ever been infected with the disease he would still be living a great life. Now are you saying this is a natural way for my grandpa to die? I'm not trying to bring in personl matters to this at all, in fact I hope this person level doesn't continue, but I'm using him as an example to show you that disease is NOT a natural way for someone to die.i see diseases, some, as a form of natural selection so to speak.
Also, the children who are born downsyndrome (sp?) could live a much better life if there were means of preventing them from having that disease. However, if all people felt that there disease was natural and should not be cured because the rest of might suffer from it, no such means of prevening that disease could ever take place.
Honestly, I think that reasoning is absolute selfishness and unthoughtfullness towards the well-being of others. I guess it's that I see a human life as being important enough so that there life/life span shouldn't be altered the least bit by disease.