One thing you learn about children - all are different.
I compare their behavior to be like some puppy dogs I've had over the years.
Some dogs never want to chase cars, don't chew up anything, don't dig up the flower beds - they only want to please you.
A stern look or word and that's all it takes.
A pup from the same litter can be a car chaser, a chewer, a digger and always into mischief.
One you don't need to keep 'tied up' on a runner, the other you do or else it'll get killed on the road.
All discipline - physical or otherwise - is not necessarily abuse but can be.
A wise parent figures out what discipline is needed with each child and does accordingly.
As I've told my sister many times "I wasn't a better kid than you, I was just a smarter kid - I saw what you got and did a better job of avoiding it."
And I told my daughter before she had kids - 'You draw the line wherever it suits you - but do your kids a favor and don't move it on them.'
I reckon I seemed to have turned out alright cause I learned very quickly there were consequences for all actions.
That lesson served me well in my 'vacation' in the USMC - especially during that 11 week resort they run down at a place called Parris Island.
I learned there that some kids figure it out quickly and some don't ever figure it out.