There is a difference between a reasonable suspicion that a person is in danger, and an old man who is in pain saying stupid things out of the hearing of the police.
Yeah except that if the police were called to a residence, and they are told of a threat (even a threat to oneself) and they don't do everything they can to make sure no one is hurt, they open themselves up to lawsuits. Imagine if they showed up cuz a family member called and said "grandpa is threatening to kill himself" and grandpa told them to fuck off, so they left then grandpa killed himself? How could the LEO possibly ascertain whether the threat was real or not? They aren't trained for that.
That certainly justifies them electrocuting a 68 year old man with a heart condition.
I have said this before, and I will say it again, a Taser is a weapon, and should not be used simply because someone is not cooperating with the orders of a LEO. It should only be used when the life of a LEO or another person is in immediate danger, and the LEO does not want to use his service weapon.
If LEOs were trained to think this way they would not be Tasing old men in their living rooms, or old women on oxygen in their beds. This might mean they actually have to call for help to handle these old people, and that might hurt their macho image, but they will live, and so will a lot of people that LEOs routinely Tase for inadequate reasons.