Because I tried to everything possible to become the best player in the world? Do I believe steroids and growth hormones helped me achieve that? Yes. Were there a lot of other players doing it that I had to compete against? Yes.
These are my friends, my family. It would be hell on earth to spend the rest of my life leading them into situations where some of them are going to get killed... but it would be worse watching someone well-meaning but incompetent or untrained double those deaths.