I agree with this^^.
I agree that the Woodbury kid, Toby I think, may have tried something. When most people see a kid pointing a gun, they would probably try something thinking that a small kid wouldn't shoot them and is all talk....not Carl though! Plus, if someone tells you to drop a gun and you inch toward them still holding the gun, trying to talk to them slowly saying that you are going to drop the call but haven't yet, then yeah you deserve to be shot.
I was sort of thinking that the kid was going to try something and past events have shown us that if someone doesn't immediately drop the gun when they are being threatened by someone they view as weaker then they will try something. I am sort of glad that Toby didn't try and shoot Carl or Hershel, and would have definitely said, "dang they should have shot him before he tried something cause they knew better than to trust him. You never trust a guy that doesn't drop a gun immediately." However, since Carl shot first we will never know what the kid would have done.
Had it been an adult and not Woodbury kid (Toby) or had someone else from the group shot the kid I wouldn't feel as bad. However, because it was Carl and from the path we see him heading down, "I should be there. I can help. Blah Blah Blah," one can only wonder how Carl is turning out....more shane and less rick.