Review my posts. You will find that I have repeatedly stated that the person who did the shooting may well have been in the wrong, but that we do not have the full picture.
Apparently, the local Law Enforcement folks did not see the need to arrest the shooter or file charges at the time, which says there was at least some significant question in their minds about whether the shooting was unjustified.
It seems you would hold all firearms owners responsible for this event.
If a drunk runs over someone's 5 year-old at three AM, would you blame all drinkers? all drivers? or would you wonder what the 5-year-old was doing in the street at 3 AM?
Whatever extenuating circumstances are involved, the simple fact remains, the kid would be alive today if the kid hadn't been screwing around the guy's house at all.