He never said what his age was, for all we know he could be 15,
also, you cant just blame stuff in general with violence, honestly if him making paper guns would stop him from shooting up schools, i wouldnt complain(not saying your a psycho just making a point)
I mean, if he turns on the news, hes gunna here indepth detail about deaths in the war and such so whats the difference, any direction you turn theres violence
Anyways these are pretty cool, thats probal the best you could do with paper, but to get it rounds maybe roll em up, get a rubberband and let sit for a while to give it that *curve* and just tape it the right way and it wont be so blocks.
Or do that, make a base and tape pieces invidualy so if a barrel was 1 sheet of paper, cut it up so its like 10 and work on the shaping, maybe if you have the cash get some clay