Taking a life is always a serious thing but is not always a bad thing.
Our society has put such a stigma on killing that the whole Mark of Cain thing gets pushed over even on to righteous homicide.
I don't think a justifiable killing should be celebrated with balloons and champaign (at least not publicly
) but neither should it be treated like some horrific tragedy.
Kudos to the younger for acting appropriately under extreme pressure.