This leads to the fact that if they had not gone to the doctor, they probably would have lived longer. Read the articles at Natural News.
There are tribal societies in South America and Oceania, which are isolated from the civilization. There is no modern medicine available to these people. Yet, the average life-expectancy is somewhere around 25 years. Compare that to the life expectancy of 85 years in Japan. Still you believe that modern medicine causes a decrease in the life expectancy?