Can someone explain to me why anybody actually needs to shoot a gun? Especially a child?
Nobody should have access to them except for the police/army. I'd even go as far to say that guns are not required for hunting.
The reasons for the USA gun laws were fairly clear when they were written:
1) To enable individual states to form armies that would be powerful enough to defeat the federal government if it tried to takes states rights away.
2) To enable the people to revolt against the government (local, state or federal) and overthrow it by overwhelming force.
3) To dissuade invasion by other countries.
They're sort of still appropriate or might become so at some point in the future. Maybe another country might consider invading the USA at some point in the future. Maybe some form of tyranny would arise in the USA at some point in the future.
I see their reasons, but I'm not at all sure it's worth the extremely high cost they pay for widespread lightly controlled gun ownership and use.
But this case is a bit different because it's not about gun use per se, nor even about the age at which it's appropriate. At the core of it is a lack of understanding or consideration of basic physics and biology. She lacked the ability to control her own use of that weapon on full auto and there was no way she was going to have that ability. Not a chance. So it was foolish and dangerous from the start. It's not about guns alone, it's about being bloody dumb with guns. They're not tools. They're weapons designed to be very easily used to very efficiently kill. That's the whole point of a gun. That's why they replaced swords and bows. That's precisely why they were written into the USA constitution. Full auto weapons aren't even designed to be particularly accurate because they can't be. They're about throwing lots of bullets in the general direction of whoever you want to kill, especially if there's a group of people you want to kill.
In the context of a gun-laden culture, I can understand teaching a child to use guns effectively. It's even sensible in that context. But not guns they can't control. That's dangerous and stupid even in that context.