Okay, I'll admit two things:
1) I was a LEO, but it was a LOOONG time ag;
2) I'm not really conversant with the latest electronic wizardry available to LEOs as "less-lethal" alternatives.
Addressing the second issue, when I heard "taser" on the news, I immediately thought of the device that launches two darts, attached to the laucher/power pack by wires, that penetrate the skin or clothing of the target. The 75-year old woman's description ("I saw her draw a gun from her belt. . .") also sounded like this device. Reading the accounts quoted in this thread makes it sound more like a "stun gun" that uses two metal contacts pressed against the target.
The second point: I dealt with youths, the elderly, druggies, drunks and genuine "hardcase" violent offenders. I never had to shoot anyone, but I did make use of CS (it was before OC became available), nightsticks (remember the old Monadnock PR-24?), a Kel Light (the original "metal police flashlight), and a couple of Bucheimer blackjacks & saps, in addition to empty hand restraint and control techniques.
I saw the 75-year old on TV; she appears fairly typical; not unusually large, moves and acts age-appropriately.
I am always reluctant to make a judgment without fairly hearing all facts, and am willing to have the officer and chief explain to me WHY an active duty LEO would feel the need to use ANY weapon on a 75-year old woman, EVEN if she "took a swing" at the LEO.
That said, I'm afraid the explanation would have to be great!! If I had ever done so, I'd have worried more about the reactions of my fellow officers than those of my superiors! I'd have been ridiculed and ostracized, and (I think) legitimately so. If the LEO can't handle this individual without using that level of force, I shudder to think how she'll respond to an agitated 12 year old male juvenile.
My main worry would have been that the elderly woman would injure herself, either by hitting me and breaking her hand or losing her balance and falling. As I stated, I'm willing to hear why the officer used electric shock instead of simply controlling and restraining the "offender" (and I'm even reasonably certain, form info from the various sources- the woman, the police and the nursing facility staff- that the woman did more to provoke the incident than she's admitting), but any such explanation would probably cast grave doubt on this LEO's competency to execute her duties.
I just can't even visualize any realistic justification . . .