Rich people who commit crimes usually fall into the crime for money, or bored idiot with too much money not used to reponsibility categroies, but most cirme is still comited by poorer in people in poor areas.
the values don't have to come from the family, they can can/usually come from all around somone, from the rest of society, people they meet, freind ect.ect. Also the front put up by the nuclear family can alienate people more, your more likley to end up with either strict converts, or rebellious oppsites to the message given out by the family.
My understanding of the term is 2 stright parents married together with a few kids, pissibily in contact with extended family/ies.
( edited after reading the above posts properly)
Whether the nuclear family creates values is questionable, the kids will end up loaded with baggage from the parents interactions more so then with other family units, and then they will have to deal with them later( usually in mid life crises :laughs

It also ties people more closely to the family, which isn't always a good thing, and then splits from the family are more painful and damaging.
Also takign it from the normal interpratation it means the adults are stright, a man and a woman. I would call into question how good that is, as again it will give them more pre conceptions about things, and I don't see the issue with gay parents. but i disgress, this is more about whether the nuclear family is the best possible family unit.
Hmm, horses for courses, some people do better with it, others in diffferent styles, more then the type of family is the parenting style that makes the difference I suppose.