I agree, the AT-4 is a nice little item. But I'm not sure if it's idiot proof.
LOL, there's the legend from the Persian Gulf- never could find out if it was true or not- about the NCO from the 101st Airborne who was going to give some of his soldiers a class on how to employ the weapon. Seems he had given the class a zillion times before, as have I. What he didn't take into account was the AT-4 he was using to give the class didn't have the little yellow band on it denoting it as a "trainer". He went through the whole class just like he had so many times before. Pull safety pin, pop up plastic sites, set range, cock arming lever, "back blast area clear!"- and then he pushed down the little plastic trigger...
The legend has it, nobody was hurt but he took out a bunch of tents in the tent city. I doubt it's true, but I've seen Joe do a lot of stupid things. I saw an E7 in Bosnia get "flustered" one day as he tried to enter camp. We had clearing barrels outside the gate and a very strict procedure for clearing all weapons. He whips out his 9mm and never drops the magazine. He charges- a round is ejected. He pokes out his lip, like- "Hmmmm?". Charges again- another round is ejected. The procedure called for three charges and then pull the trigger to make sure it's clear. He charged it one last time and was just about to pull the trigger when an LT standing nearby grabbed him and stopped him...
I have heard alot of crazy stories in my day but that AT-4 story takes the cake. Oi...
I guess in the end...you're right...there are all kinds of things that can go wrong.