The point being, under the parameters of the OP concerned about safety and kids, if a kid is playing with the trigger, it is unsupervised. I assume the fear of the OP isn't for attending a range, true? I don't think you were giving me a fair shake in this obvious assumption.
Did you even read the follow up from the OP? There is no hypothetical at this point, we know what his concern was, and it has nothing to do with unsupervised children.
Kid touching that trigger, not at the range and intending to hit a target, is a crime.
Under the supervision of an adult? No that by itself is not a crime in a number of states. You keep omitting supervision. It doesn't have to be at a range either. You could have private property large enough to allow shooting on it. For that matter what is your definition of a target?
44amp already pointed out your penchant for making very broad statements. For someone that keeps pointing to the law and potential crimes, you should know broad statements rarely if ever apply. The law is a very specific thing, intentionally so.
If your kid somehow fires your gun you are carrying in public, you will get charged for a crime against the society you live in.
If an adult discharges a firearm in public without due cause that adult will likely be charged with a crime. Negligence with a firearm is a crime and I don't see anyone arguing against that here.
The overarching premise of some course/test needs to be administered is proven by a thread of a gun owner asking about different trigger "safeness." The trigger is the action step to a bullet firing.
While pressing a trigger does fire a bullet, there has been no shortage of debate by both members here, instructors, police officers, the military, and even members of the media about whether firing mechanisms should included additional safeties, whether it be additional force such as in a DA/SA pistol or the manipulation of an added mechanical device like an external safety. This debate has been ongoing for decades. I expect a shooter at some point in his/her time as a shooter to wonder about safety and whether all designs are equal. No doubt you can bring up the "keep your booger hook off the trigger" argument, but the reality is other designs do require more force or more steps to discharge a firearm. I don't think that makes them inherently safer nor is there any firearm I would leave accessible to a child, but I completely understanding someone asking if some designs are safer as those designs are championed as such.
Make no mistakes here. I have no tolerance for leaving firearms in reach of unsupervised children, loaded or not, as was the entire point of my first post. I am a big proponent of safes and bedside lockboxes. What I fail to agree with is your assertion that the OP's question is akin to incompetence and should make us question whether he should have the right to own a firearm. To me the OP's question is that of a concerned father and gun owner seeking to do all within his power to prevent a firearm related incident/injury.