I am wondering why it wouldn't strike Amazingmum to buy and install outlet guards instead of breaking the will of a child to stick a tongue in an outlet. Most home hazards can be childproofed pretty effectively and cheaply.
Thunkshead -- true, 'hot' is something a child much younger could be expected to understand and yes, concepts need to be enlarged upon as children grow and develop, but the concept of injuring an eye or causing blindness is still a very abstract one to a child of 3.8. A child that age is still too young to understand what that might mean. At that age a child is quite possibly used to the idea of something getting hurt and being kissed better. The concept of 'next week' is very hazy and the idea that a booboo arising from 'dangerous' behaviour would still be there next week leaves them with their eyes glazed over.
ReallyYummy I disagree with you completely. In particular, I do not understand how you can assert that teaching right from wrong in the case of 'do not hit' can be accomplished by hitting or whatever you want to call it (this is the bottom line of your argument). There can be a difference between what is legal and what is right, or wrong obviously if an adult finds it difficult to distinguish the difference the child must be very confused indeed.
Children of approximately 4 still hit each other and take each other's toys, still go ahead and do impulsive things despite the glimmerings of appreciation of what is right and what is wrong. They still think it is 'right' to get their own way. As they become aware (through teaching and through their own reasoning and development of empathy) that there are behaviours that are right and behaviours that are wrong they may try to think a little before acting, but can't do this reliably, and their motivation is normally the consequence they associate with making the acceptable choice or making the unacceptable one -- it comes from outside themselves; they crave the approval of important people in their lives, and at this stage catching them being good can accomplish a huge amount in terms of training.
Using their toys, they will sometimes mimic scenarios of children doing unacceptable things and an authority figure weighing in. Then they can turn around and do the exact same thing to another child and feel very aggrieved when the authority figure steps in and they are on the receiving end of the criticism.
They become very conscious of The Rules about age 5-6, which is the golden age of telling tales on other children to the teacher so right and wrong/acceptable and unacceptable/Do and Don't are there as concepts but only in limited forms; the morality of tattling is something beyond their ability to consider. Even up to about age 7 or 8 they are still progressing along the way to understanding the concepts they have a sense of fairness that expresses itself in the question 'what's in this for me?' It is really only after this stage that children begin to feel any personal responsibility to maintain the value system they live in.