[ronster]

I live in an "active retirement" community where the minimum age is 55 years. I was the second resident to move in and have watched the "active" part of it give in to the drive for 100% occupancy. Many of the residents are not active due to age and some of them are starting to show signs of dementia and Alzheimer's. One particular resident, a male who is 74, has been diagnosed with the onset of Alzheimer's (his admission) and has recently begun hostile confrontations with other residents. Nothing physical has happened yet but I know that he is heavily armed with two shotguns, a rifle, two pistols and a knife because he showed them to me a few months ago. After he started a confrontation with me a week ago I learned of the other confrontations at a recent party and decided to notify management about his weapons. Management can't intervene at this point and neither can the police as no crime has been committed. I'm certain you understand what I'm getting at and the potential tragedy that could unfold not only to himself but to others.
Has anyone dealt with this situation before and what did you do about it? Are there any legal steps that can be taken to disarm him? Should I just let it go with informing management? As far as I know he has no family, is single with no girlfriend or friends.