Unprepared does not equal unethical. Just because these guys are not experienced with shotguns does not mean they are bad or unsafe hunters, or that they will make bad decisions. Why do you think they are asking for advice?

If I had to go hunting tomorrow with a borrowed shotgun with a bird barrel, with buckshot for ammo, I wouldn't hesitate to go. I must be unethical right?

Give the high horse a rest, he must be tired by now.