Issues guns often get conflated as if guns aren’t inherently dangerous. So saying this is bad parenting deflects from the obvious that the first issue is the gun, not the child.
So no person should leave a loaded gun out unattended, regardless of parent or not. The reason is again the obvious, guns are inherently dangerous. Again, the first issue is the gun, not the child.
Nobody wants your guns. Unless of course your some kind of criminal or have some mental health problems. It’s about keeping guns with their legal owners.
The gun didn't decide to shoot the mom, the child did accidentally. This is why I made the analogy of the heroin syringe. Or you can put a knife there. Or anything else that can cause harm. A 2 year old has no idea what it is handling, which is why a good parent puts controls in place to protect a child. Hell, we put those little plastic thingies in the plug sockets so curious little hands can put fingers inside them. So leaving out a loaded gun? Yeah, really bad parenting.
But if someone is living alone, leaving a loaded gun out is less of an issue - still not recommended, but certainly there's no danger of a child picking it up. So the gun isn't the first issue, just like the knife or heroin isn't. Its the decision by the parent to leave a deadly object in range of a toddler.
As for keeping guns with their legal owners - I agree. So how do we do this? Please note I've asked you this before and gotten nothing for my trouble.