The guy needs help for sure, and maybe the family doesn't/can't deal with it? Who know's. Maybe it's easier to have him hang out at the gunclub all day than be at home.
Regardless,,he needs intervention. He must have a Doctor or some history of medical care,,not that you're going to get into that.
You cannot babysit the gunslinger at the club. A tradgedy will happen, then everyone will point the finger at the 'club' and ask 'why did they allow it to happen when a problem was so obvious'.
The club officers (Someone must be in charge) should in the least go to the local L/E and start the process of making a report, making a complaint, ect. about his actions.
An in person visit to the L/E. No phone cal,,no email, no FAX. Go there in person as a group and demand to see someone about the problem.
You don't leave w/o a written report being taken about the situation.
....and you do it now...
Bring witness names, ect so they can followup if needed.
The Club Pres/VP/ ect owe this to their club and members. You take on responsibility when you run for and get a position in an orgnization,,more than free coffee and a parking spot.
L/E will advise what's next. Revoke his membership probably. They will handle the family & referal mental hygene side of it.
They may very well do nothing or stall with it,,or take quick action and get the guy some institutional help.
In the very least you've brought it to their attention,,at their office.
It may sound cold, but when somthing does happen, everyone is going to be looking quickly to be able to point the finger of blame at someone else.
At least you as a club tried with a face to face meeting with local L/E.
Even if they just end up doing referals to social and med agencys,so what,,job accomplished. That's part of their job,,and not yours. They have the resources.
Bottom line, the guy gets help, and no one including him is further endangered.
Just the way I see it.
FWIW,,the old guy could and most likely will be any number of us on this Forum in the not so distant future. Not fun to think of,,but maybe some advanced thoughts on how it should be dealt with.
It's a terrible disease..