I didn't really specify it had to be physical, discipline, I agree on that whole front of what you said- but just one thing
Abuse can be done without malicous intent. Abuse can happen by complete mistake. Abuse is to treat something or someone with cruelty or violence, especially repeatedly. It says nowhere it has to be intentional cruelty. You can think you're helping even when you're being abusive. It will still be abuse whether it's meant to be or not.