I will simply point you to the trump dynasty to reflect that what you are saying is common everywhere. Scumbag father, Scumbag kids.
And equally, not all travelers are like you say, and not everyone labels them and disadvantages them as you have indicated.
Many are, and many do, I will accept that of course. But when looking at a social problem you cannot deal in absolutes.
It is the government's responsibility to apply standards of education equally, and to provide the systems that allow all kids equally the same chances. Of course these kids will have it harder and the government fails miserably to do this job.
But again rather than complaining about human nature, if you really cared about it, you'd lobby the government to enact better programs so your hard earned tax money is spent efficiently and wisely so that over time these people can be a net contributer rather than a net loss.
Here again I'm talking policy, not specific cases. Each case needs to be examined on its own merits and each person must take their own individual responsibility. But travelers as a group are disadvantaged, and so it is harder for them. This woman, when she was 15, because of her background, ended up on a path that many could see ending here. Why not instead try to make it so she doesn't end up on that path?