That is a terribly written article on so many levels.
A big issue that I see is the unrealistic expectation of what a stun gun can do vs what a Taser can do, and how many different ways even a Taser can be ineffective.
A stun gun relies solely on pain compliance - It does not feel much different then a hard pinch, a "Dead Leg" type punch, or a bad charlie horse cramp. It does not knock you unconscious for minutes like on TV or movies. It just hurts and as soon as you break contact from the stun gun, which is as easy as getting 1/8" of distance between your skin and the device, the pain stops immediately. If you have a determined attacker, all you are doing with it is pissing them off.
A Taser is a different animal and has the ability to completely incapacitate an individual for a very short time if deployed correctly - but there are a lot of considerations that need to be taken into account to use one successfully. AND just like a stun gun, once the device finishes its cycle, there are no lasting effects and the target is free to continue their aggressive actions with no after effects.
Everyone is clamoring for these devices but they just don't know what they are, how they work, any of their shortcomings, or the required TTPs you need to use one of these successfully. And, at the end of the day, if you look at our self defense laws - any time you would be justified to use one you would most likely be better served with a handgun.