Oh, yes, stifle the creativity of the child because the world might hurt him.  The world is dangerous, deal with reality.  Kids are resilient and this kind of hobby will likely lead to a far healthier, fitter, more prepared to deal with the world life, than any poor excessively sheltered kid.  Sure, learning how to minimize risks to a reasonable extent is smart and necessary, but come on, deny a kid an obvious passion in life?  I think you're crazy.