The author's right to ask for better data and tracking of donors. That said, his current worries are likely to be heavily informed by selection bias:
> Five years after the surgery, when I was 23 and getting ready to go to medical school, I began working in a research lab that was looking at kidney donors who had gone on to develop kidney failure. For that research, I talked to more than 100 such donors. In some cases, the remaining kidneys failed; in others, the organ became injured or developed cancer. The more I learned, the more nervous I became about the logic of my decision at age 18 to donate.
If you spend a lot of time talking only to donors where things have gone wrong, yeah, you'll be paranoid. Reminds me of being a cops reporter in which you strongly associate certain neighborhoods with shootings and murders because, professionally, those incidents are the only times you ever visit those neighborhoods.