You are clueless on this. You dont have kids or grandkids, do you?
Not yet. Though I do have a step sister and brother, who are young enough to be considered "kid" and "baby". I also remember my childhood quite precisely, something a lot of people here seem to have forgotten...
So if you smack them in the rear to get them to cry, there is no
permanent damage, is that ok too? Even if it bruises, that will go
away, no permanent damage so its fine?
No, because you have crossed a frontier. When you start having to "touch" a kid, you have already lost.
However, note that not all countries agree on this one. In the UK, it was not only perfectly acceptable for a teacher to can a pupil, but it was actually expected as part of the educative process. So, this is a very culturally related topic, with the USA, Canada and South America at one end of the spectrum and UK and some asiatic countries at the other.
Giving a child a candy bar then taking it away with the express
purpose of making him/her cry, thats borderline abuse.
If it's repeated, yes. If it's without purpose, yes. Otherwise, I don't see the problem with it. My parents subjected me to far worse torture, and on monthly basis. I can assure you it took me a long while to understand the purpose behind the orthodentist... And it gave me nightmares the like of which these candy deprived children probably do not experience.
A normal kid will be subjected to far worse torture from his peers. If you still believe that kids are nice among themselves, you are grossly mistaken. Having your candy bar stolen is on the most benign side... Some kids develop severe trauma, neurosis or depression from the treatment they receive from their fellow classmates...
It not about whether there is permanent damage, you are
taking adavantage of and abusing a child for profit.
That's something many parents do on a routine basis!
What do you think of the parents that push and force their children into a sport, a music instrument or education they have no interrest in? Nowadays, some children are kept so busy they don't even have time left to play. These parents
use their children as substitutes for everything they did not manage to do in their sad lives. These parents do far worse than depriving a kid of his candy bar
once in his life! Yet, they often get all the admiration of the other parents for turning their children into a trained monkey.
What about all these third world parents for whom a kid is mostly a retirement insurance?
What about these parents that use their children in the cinema or advertisement industry?
What about these parents that impose their faith, lifestyle or opinions on their unwilling children?
I think we have much more important and real abuses to deal with before we bother about a single candy bar deprivation event...