Because there are too many stupid people in the world. One of whom was apparently allowed to parent an 8-year-old boy and be responsible for his death.
Click on this link with the warning that the stupidity is terrifying, heartbreaking and unbelievable. The father is the director of a Connecticut hospital’s ER.
Edited to add: At the bottom of this link, there is a picture of what appears to be a kid shooting off a Heckler & Koch while somebody else takes his picture. The dad involved in the kid’s death was also taking a picture. Wonder how that pic turned out.
*I note that I used to be pro-gun. I’m also a good shot.
Resist racism 
hey resistance, i am a good shot too. i could shoot a squirrel in the head with a 22, i even had a little lady wesson from my father, actually it was a tiny german luger.
and i hate guns, i wouldn’t have a gun in my house if you paid me.