The idea of that of you give the child something to value themselves for,albeit their self esteem will improve and maybe they won't become an abuser.
I'm a primary teacher.
I don't reward bad behaviour but I will find any opportunity I can to value a child who has such a shit home life that their self esteem is on the floor and they take it out on others.
At primary, jobs are a coveted privilege. There are two girls in my class who have shit home lives, neither is very academically able, nether has a 'spark', neither gives us much reason to reward them generally.
When it comes to the end of term and I'm taking down displays, they all want to help but it's these two girls' job to do it. This is a very coveted job!
They pay great care and attention to removing and organising the display resources, they use their initiative and they follow instructions (it's about the only time they do).
Tbh, other children have other jobs to do on a daily basis but this one is theirs. And they bloody love it. They take such pride in their work while doing it. And I'm proud of them too.
It means that for that day, if no other (and I do give them other opportunities of course - this is just one example), they feel worth something, important, capable, valued. And tbh I don't really care if someone else's parent's nose is pushed out of joint that they get to do it.
They get plenty of sanctions for their poor behaviour. They have as much right as anyone else to be rewarded for their good.
As a footnote, I also recognise the children who always work hard and do as they're told. As do their parents. As does everyone else. They get opportunities that these two girls never do because of the disparity in their school attendance, reliability, behaviour.
If children never have their positive qualities recognised, how do we expect them to realise they are as valuable and worthy as anyone else?