A child, when born, is like an empty pot. What it will become as a person depends what is put into it. The materials forming the pot may or may not be a bit bent, but the total of it and the substance it will then contain will still depend what is put in. If good in, then good out.
We can rabbit-on about the baby's brain cells being the same ones that will last it as a person all its life, with or without additional developing neurons, but we can take that for granted and generally accept that the person is formed of what material it gathers from others and from what it makes of what it witnesses and experiences.
We can also accept that subsequent particular training, merely as part of that experience, can lead a person to do good or ill, according to the nature of the training, obviously.
Though some little children, boys especially, from whatever cause, at a certain age can demonstrate a basic ill-will, people in general are not evilly inclined, and mostly are co-operative and, given the opportunity, benevolent. And the young are learning machines, with an appetite to acquire knowledge and practical abilities.
We do not seem to have said anything but the obvious here. So now, let's look at the world today.
Here we see whole sections of the immature of most nations trained to control others, to kill them on order as necessary, and in all cases marshall them and us politically and socially. A select few are trained to manage the rest. Others are trained in business to acquire wealth from others and for others, some to investigate, to design, to produce things some of which are good, useful or saleable, and others that are bad for all.
The tools to enable this training are basic education to enable the infant's acceptance of the principles of a basic obligatory syllabus, further education to confer abilities to absorb specialist information, discipline as in business and particularly mindlessly to obey orders in the military and other services and - overall, and controlling all these other aspects - the fiction of money made necessary and thus thereafter self-generating in a money-orientated world.
And all this undeniably is accomplished.
But we might ask who are training the trainers, and for whom? In whose interest is devised that carefully-calculated methodical training to de-sensitise and brutalise, that then enables the military wilfully to kill women and children, and torture innocent fellow-humans, and utilise the array of so-costly weaponry to eliminate populations and warp any survivors? In reality, even in whose interest are ALL the people learning about their local currencies and about using them, and then in whose interests working? - Certainly not in their own. Work to enable subsistence would occupy only a month or two per year, so for whom is all the extra work done?