Assuming the combination is 3 digits, who is to say that over time he didn't see one or more of the digits his mom dialed and figure out the rest? Because people commonly use digits that are easily remembered, might she have made the mistake of setting her birthdate, or something else that a person having close knowledge would be able to figure out?
Well then she was a fool to not change the combination.
A gun safe that your psycho son who you are trying to have committed has seen the numbers you use to open, or one that has an “easy to remember” combo that is something he could easily figure out - is as bad as not having a gun safe at all.
When you have guns you have a responsibility to keep them out of the hands of psychos.
Lame excuses do not absolve one of responsibility.
Speculation like the posts on this thread, remind me of the MSM, how have we came to this, on FR?