My Mom had dementia, and after one incident where she drove the wrong way to a neighbor's house, Dad convinced her the police had pulled her license. That and he hid the car keys.

Granted, elders need some form of independence, but when they start to become a danget to themselves and/or others, it's time to do something.

DW's aunt lived in an assisted living center, where she had her own apartment, could cook her own meals or go to the dining hall. The staff checked on the residents daily, if not more. There were trips to the supermarket and the mall quite frequently, as well as movie nights.

I agree with Ajax, do something for this guy before he hurts himself.