anything that requires a constitutional amendment to own and use should be questioned to some degree.
As to realistic solutions, I would start with intense training, in schools, in the safe use of firearms. We're teaching kids to put condoms on bananas, they should also learn how to check the action on a gun. Requiring safe storage is not unreasonable. In the case in the OP, the parents should be charged with negligent homicide.
Notice I said questioned to some degree, not abolished.
There are practical limits that can be applied to gun ownership/use that would still fall within the constitutional allowance. The problem is, the second amendment is treated as an absolute. Even the first amendment does not quite have the reach the second amendment is allowed, let alone have an organization to make sure it is upheld on those absolute terms. The NRA does their damnest to make sure NO gun control is passed. Any sane person can see something is wrong with that.
d4g