Now more and more people began to care about their children's education. One of the most important problem is how to deal with the mistakes made by children and how to correct. To err is human, I think it is allowable that children make some mistakes.
Most of parents have their jobs and they can not supervise their children all days. Moreover, children usually make mistakes by accident.In fact,it is hard to avoid children to make mistakes ,such as they will copy the homework of their classmates for saving time to play computer games, throw garbage anywhere because it is bothersome to find a garbage can, or skip classes to play basketball. Children always make these ordinary mistake.
The key point is how to correct. At lots of times, telling may not let children deeply understand why not to do those things, but as personal experience, mistakes and consequence to themselves can give them a good lesson. For example, when parents ask children not to copy homework, children just think that is convenient. But copying homework  causes failing the exam, they can know it is terrible.Then parents tell them the disadvantages of copying homework and deeply teach their children that opportunism including copying others' works only makes them be good for nothing.
When it comes to  human and society safety, values and personal principle，some faults can not correct after they happened. Maybe children will rob classmates or junior schoolmates because they just think it is cool and exciting，but they don not know they have already broken the law. When they fight with each other,  it also hurts their and classmates' safety because they usually use cutter to threaten.When I was a kid, bloody incident sometimes took place among high students  because of robbing in our school.
Some serious faults must be controlled by education and publicity. Most of mistakes of life made by children can give them a profound lesson, and they always can draw inference to know more points.