I understand the point you are making. I'm sure that procedure would have you do what you are describing and that the police were using lesser methods. However, we are talking about a 95 year old man. Sometimes the "procedure" might simply be overkill. This strikes me as the same overwhelming force idea that comes from military doctrines.
First, the subject was NOT electrocuted. The Taser delivers a carefully designed and thoroughly studied electrical pulse which, when it works, incapacitates a subject doing minimal harm, and with less chance of serious injury to both the subject and the officers.
Second, SWAT or Tac team is a specific term. Unless you happen to be Humpty Dumpty, we can't make them mean what we want, when we want to. It's a special purpose police unit, using special weapons and tactics (hence the acronym) to respond to situations that are beyond the typical capability of a "normal" police officer. Using a few tactics from the SWAT arsenal doesn't make an action a SWAT operation anymore than putting boxing gloves on a TKD or BJJ student makes them a boxer.
Look, the particular situation described here is a no-win. The cops were stuck making the old man do something he didn't want to, and especially if he was armed, they were really over a barrel. I"m waiting for a similar mess where I work; we've got a lot of older folks with various cognitive issues, and some of the caregivers are clearly over their heads. The day's going to come where I or one of my colleagues has to forcibly deal with some of these people -- and it's going to end no prettier than the case here.