One might beg the answer to the question of why they couldn't wait such a person as your describe out instead of putting holes in him...Hell, they give really bad guys more time than this.
OK,that's a fair response.But when the guy starts shooting all bets are off IMO.It sounds as if the family might have had good reason to be concerned about him (again,age...health profile).Perhaps *they* should have checked on him rather than call the cops.Even if he was "far gone" mentally he probably wouldn't have felt threatened by a family member.I worked in a hospital ER for years.I dealt with many a person with serious psych disorders,including paranoia.Some of those people were elderly.It's a sad,sad situation...particularly when it's an older person.