Still there is a risk of death. Tasers do not constitute the use of non-lethal force.
O.K. — the above was facetious (although true).
No weapon, including the Taser, should be over-used, or used carelessly.
Seriously now, consider the alternatives to the Taser:
1. Shoot the suspect with a gun — almost certainly lethal.
2. Pepper spray — sometimes (rarely) lethal — not as effective at stopping a determined violent criminal — could be fatal to the LEO, or to bystanders.
3. Fisticuffs, wrestling, or other bare-hand martial arts — places the LEO (and bystanders) in immediate danger — could be fatal to LEO or suspect — often not effective at subduing or capturing the suspect.
4. Billy club, bat, or similar weapon — could be fatal — high chance of brain injury — places LEO and bystanders in danger.
5. Ignore the situation — life and property of innocent people put at great risk. People want LEO to protect them & apprehend suspects with appropriate means. We also want to reduce risk to LEO. They (LEO) need a variety of tools to do their job safely and effectively. On balance, it seems to me that the Taser has a place in the LEO toolbox.