I have seen people from broken homes being judged and discriminated. It's enough that these people have to deal with the trauma and adjustments of having to live without one or both parents, the discrimination from the society is totally unjust. Why would you

Assume that automatically they can't raise good homes? Why would you conclude that because they got angry or are reserved, they can't raise a good family? So people that are from good homes don't get angry or aren't reserved?
Why th will you blame them for their parents mistakes

Or try to burden them with the responsibility of righting their parents wrongs, fixing what's already broken, asking questions like, "so what are you kids doing to fix it?"
These parents are full blown adults and can't be forced to take a decision that they don't truly want

To take.
Nobody gets to choose the family they were born into. You that was raised in a "united" home, did you ask to be born in? What did you do to be born in that family? You should be grateful, and if you can't be a positive energy in their lives, leave.

Don't cause more harm. What you should be concerned about is the pattern they've put up in their daily life. I am not saying family has no effect on individuals, but some people actually have a grip on it, and are steady. They have learnt from the close examples they've seen

And will sacrifice more to keep their homes. So don't judge, or jump into conclusions. Assess them as individuals, and let your assessment be as least biased as possible.