Retrochic - // ... and 15 years old is in my opinion an age when they should know right from wrong. //
Absolutely but ...
A fifteen year old girl will know that stealing is wrong, that's a black and white issue, no exceptions.
But that same fifteen year old girl is enduring (and that is the word!) puberty, with a mass of contradictory feelings, and influences, and nothing is as it seems. Add to that her hormones, and the desire to be 'grown up' - strictly on her terms of course because teenagers are unable to view the world with the objectivity and maturity of an adult, and you have a person who is vulnerable, but doesn't really understand what that means.
That is why we, as adults, guide them when we can, and rely on other adults to treat them properly when we can't.
It's just about a little bit more care and consideration, and a little bit less lust, ego and stupidity.