Normal kids are turned into Borribles very slowly, almost…

““Normal kids are turned into Borribles very slowly, almost without being aware of it; but one day they wake up and there it is. It doesn't matter where they come from as long as they have what is called a “bad start.” A child disappears from a school and the word goes round that he was “unmanageable”; the chances are he is off managing by himself. Sometimes it's given out that a kid down the street has been “put into care” because whenever he got home from school the house was empty; no doubt he's been Borribled and is caring for himself someplace. One day a shout might be heard in a supermarket and a kid with the goods on him is hoisted out by a store-detective. If that kid gets away he'll become a Borrible and make sure he isn't caught again. Being caught is the end for a Borrible. So Borribles are outcasts but unlike most outcasts they enjoy themselves and wouldn't be anything else. They delight in feeling independent and free and it is this feeling that is most important to them. Consequently they have no real leaders, though someone may pop into prominence from time to time, perhaps because he has had a good idea and wants to carry it through. They manage without authority and they get on well enough together, though like everybody, they quarrel.””

— Michael De Larrabeiti