The thing with the supposed going off by themselves. If one is handling the rifle and it "goes off" as some contend, the likelihood is that there was a finger on the trigger while unloading or slamming the bolt closed or whatever. So ask yourself. What is a person, especially a young person going to say when you ask if they had their finger on the trigger just after it "went off"? You guessed it. Not me, uh uh, not me. The gun just went off.
This is a potential drawback of the blind magazine model, the ADL, in that the rounds must be run thru the rifle manually by bolt operation, instead of dropping the floor plate of the BDL. Its all too easy to have that finger where it doesn't belong. I saw my dad do this once while unloading a Rem 700 ADL. Funny thing is, the Rem trigger thing was in the news about that time. When I quizzed him, he admitted it was quite possible he was careless, but the rifle was pointed away from everything and nobody got hurt. That is the point of safe gun handling, if the man made mechanical device fails, and they can and do, RULE ONE keeps everybody safe.
There are many, many unintended discharges every year, but very few are the fault of whatever gun had one.