"Show me a young child, that is constantly battling/kicking off/running rings around their parent - and chances are that is a secretly unhappy child, who feels very vulnerable, and deep down is scared that they can control/manipulate their parent to such a large extent."
It could equally be a young child who is vulnerable and scared for some other reason. Casting my mind back over children of my acquaintance, the children who were constantly kicking off included:
the child who knew that his mother was terminally ill
the child who had been traumatised by adoption
the child who was in constant pain with an undiagnosed medical condition but did not know that this was not normal because he had never thought to ask so nobody else realised anything was wrong
the child who was worried that a medical condition would leave her permanently unable to walk
the child whose physical condition had been misdiagnosed as psychosomatic
the child whose childhood was dominated by a sibling with MH problems
the child who was later diagnosed with Aspergers
the child who had been moved between foster parents
the child who had missed out on important stages of social development due to glue ears causing undiagnosed deafness
All the above had very good and firm parents/carers.
Show me a child who is constantly kicking off and I will know that there could be all sorts of reasons for the behaviour.
Ineffective parenting could be one of them but it could equally well not be.
Most of the children above came out all right in the end but there were many difficult years for the carers to get through first- and a lot of judginess from people who saw snapshots and jumped to conclusions.
I do remember a particularly hairy experience of the whole family being pursued down an Italian street by a horde of hags women yelling in Italian "beat him, beat him" at my father who was trying to control db during a meltdown. Obviously a bunch of women who made a snap judgment- but the time was hardly suited to a longer explanation.