In the first picture, the hypothetical firearm (I still don't see it) is most likely being carried by an Israeli reservist. They carry their duty weapons with them when out of uniform, but they're unloaded.
If you're open carrying solely to make a political statement then carrying with or without a magwell won't make much of a difference. If you're open carrying (or concealed carrying) for protection you are handicapping yourself by not carrying with a mag inserted and a round in the chamber. If someone personally doesn't feel comfortable with that I understand. It's still better than no gun at all.
What level of training, as in rounds fired, would someone say, is sufficient to go chamber hot?
Is a box of 50, when you first get a gun enough? Is 50 a week enough? More?
The problem, is not one thing causes ND's. It is a combo of circumstances that cause them. Baby crying, phone ringing, bills over due, fight with spouse, fight with neighbors spouse, kids, traffic, weather, job, jobs, stress.
I guess we could ask the second in command at the 3 largest police dept in the state what caused the bullet hole in the ceiling of their dispatch office. Maybe the answer is there. Or maybe the 20 year police chief of another town, that has shot himself twice, in 20 years. When I see someone going condition 3, or condition 4, I do not see someone who is unfit to carry, I see someone that is thinking of all possible outcomes, and works what could happen, into their training, and into their life.
In the video clip below, I call the mindset, the Rambo mentality. No reason to have a condition 0 rifle, in a chow line, on a military base, except it does make for interesting movie viewing. This mindset, in popular culture, trickles down into the people that watch such shows, and it influences their actions. The child shot with a dropped gun at a Halloween party, is such a outcome. Why does someone need a round chambered in a pocket pistol at a child's Halloween party?
Back to the subject of Open Carry of long guns, do the open carry folks think it prudent to carry a rifle Condition 0 or Condition 1?