Sob, I don't claim kids bear no responsibility for their actions. In the UK the age of criminal responsibility is 10. Below that age you can't be charged with a crime. Between 10 and 18, kids are treated differently by the legal system, and recieve lesser sentences than adults would. There are degrees of responsibility, and all legal systems round the world recognise that fact.
I am glad to say that the US supreme court, and almost all state courts, as well as the UN, are closer to my position than yours. All ban execution of children, in the US
before age 16, for the UN before 18. From what i have seen, the only country that in recent years has executed a child (officaly) is Yemen, where a 13 year old was publicly hanged along with several adults. Even the citizens of Yemen, a rather remote, fundamentalist, almost medievel Islamic state, were shocked, and the government banned executions of children below 18.
SOB, would you advocate lowering the age for buying a handgun to 13? After all, children that age are responsible enough to be safe with a handgun, according to your views.