Re: Presumably, Jake ...
Yes they nearly do, since the nominal holders of many 'self defence' weapons end up being killed by their own weapons I guess the guns must fire themselves. The other theory is that you have to be brainless to think a gun makes you safer and not a target, so the gun must have all the brain and thus be capable of self firing.
The US habit of downgrading mental health services and then allowing any choice of mentally unstable condition to have access to guns is another issue altogether.