The radiation hormesis idea is controversial but that is a bad argument against it. Molecular scale events interacting with molecular scale DNA repair machinery

The radiation hormesis idea is controversial but that is a bad argument against it. Molecular scale events interacting with molecular scale DNA repair machinery is a different physical context than bullets. The body is hit by natural radiation all the time and so it has mechanisms for this. Not so much for macroscopic projectiles. The question is how these mechanisms behave and whether a small amount of radiation stimulates them… and then how much, for how long, etc. It’s a complex model with multiple systems and feedback loops.