I don't buy that. If it's just about 'training hand eye co-ordination' you could do that with a computer game. Or a bow. Or a paint gun. There's no logical reason why to do that you'd need a lethal (often quasi-military) weapon. Unless, of course, you aren't telling the whole story, and a major part of the appeal is imagining that you are shooting human beings.
Otherwise, making holes in bits of paper at a distance strikes me as an extremely tedious hobby.
Now it's quite true one could say the same about first person shooter games and the like, but those things don't simultaneously involve having the very item that would be required to make those day-dreams real.