Risk is part of living, and most people believe that we minimize risk to our life by making ongoing good and safe decisions forever ... living "carefully" as you say.
You seem to imply instead, that life and death are in the hands of fate, and the script for life has been written presumably before birth, maybe at conception. One could thus make the argument that living "carefully" or "carelessly" would not impact what fate already has in store for us.
We can certainly precipitate an untimely death by suicide, unless you are saying that this also constitutes a pre-ordaned proper time to die.








