larry, the reason I believe children want to fit in is that 1000's of years of evolution have driven us to form societies and create rules and build families. Children can't 'fit in' if their world is chaotic and they do need guidance, but I don't think any child wants to be in charge of their parents or wants to randomly hurt other people, because basically, its a bit rubbish. Children who can learn the rules of their society (whatever they may be) do better and feel better.
I think children are sometimes selfish and violent. Adults are also sometimes selfish and violent. However, those who can make good use of their pre-frontal cortex's and not be controlled by their selfish and violent basic instincts (Lizard Brain as some people call it) tend to do better. Adults have the big advantage of having a fully developed pre-frontal cortex. Children's brains, whatever behaviour method you use will develop at a pre-destined rate and sometimes their behaviour isn't deliberately bad, it's just immature.
So, you make your life easier by teaching your children instinctive positive ways to act. (When we come home from school we always do x,y then z. if a, b or c happens go and do f,g or h, let's practice) Very importantly you listen to them and observe what precedes bad behaviour. You teach them to problem solve or work out a way to calm down when they are feeling over heated. You create an environment where they feel valued and are receptive to what you say. (I know we all want to do this, but I have to admit that even in adult relationships it can be hard).
I don't advocate only positive methods, and I am trying to drop my woolly double speak of threatening my children with 'consequences' when I actually mean punishment. Sometimes the world is a bit tough and they can cope when things don't go their way. 'Coping' may look like having a bit of a strop, and then getting on with life, not saying "thank you mummy for turning the car round, I agree our behaviour is not up to scratch and we need to simmer down".
However, I see this as them publicly playing out their emotions, not 'being wilful'. (OK, in my calmer moments I think this way. Sometimes I have to count to 10. Or more.)
I don't think we basically disagree much. I just think you could drop the smacking.
(And I don't think society is more randomly violent. We have not had any of our leader's heads on spikes in London for 100's of years).