Well ... let's look at it this way ...

It's said you can take the boy out of the country, but you can't take the country out of the boy. I take that to mean you can teach someone most anything, if they want to learn.

OTOH, to call up another adage, a leopard can't change his spots. I take that to mean a man isn't likely to change his basic nature.

So ... how do find the ones who are worth developing? Wouldn't it be nice if there was a 'good guy' card you could ask for, some document that would suggest a person was almost certain to be a responsible person, of good character, belonged to a group that almost never misbehaved?

Actually, such credentials already exist. Alas, I doubt many employers would welcome learning whether you had them. Does anyone care to guess what these credentials are?