I voted 8, only because that was the lowest available.
Both of my kids got a .22 caliber Cricket rifle for their 2nd birthday. They don’t actually start “shooting” until about 3 or 4 years old. This means sitting on DH’s lap while he positions to rifle and assists with handling, etc. They may shoot balloons or steel targets.
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They are also taught respect of the gun, proper handling, not to touch when an adult is not present, and all that. Plus, our guns are all unloaded and locked in a safe when not being used. The kids don’t even know where the keys are. They will graduate to that level gradually as their maturity shows they are ready (in the teens).
I am confident that my six year old DD is pretty well trained. We were visiting my parents and she was looking for something that had rolled under the bed. She saw that my dad’s rifle was “hidden” under the bed and came running out into the kitchen to “yell” at him for not locking it up.
I agree that there has to be more going on here for an 8 year old to premeditate the murder of these 2 men. Just the presence of firearms in the home does not make kids do things like this. Hmmm, another man living in the house makes me think of some kind of abuse by the “friend” and kill them both because dad let it happen? Just speculating…