OTOH, I don't think he "abused" the kid, who obviously needed some form of discipline. I think the father is guilty of a poor decision.
Stun guns make excellent dog training tools also. When my dogs get rowdy all I have to do anymore is just pick it up and show it to them, they instantly behave. Mine is 500,000 volts and whe you push the button it makes an arc about an inch long between the probes, talk about getting Zotted, you can smell the ozone.