This is the problem. You assume the situation is justified and try to find an explanation for it. Would you submit this kind of theories if the article is talking about any other groups?
Just because it has a valid explanation doesn’t mean it is just, nor that it should continue. I was trying to give one possible background for why things are they way they are - not the way they should be.
The situation is starting to change, but it simply cannot happen overnight, the best case scenario for sustainable change is a couple of generations of sustained effort from all sides. Look at how the Italian and Irish immigrants went from pariahs to normal. The Chinese have gone from manual labor to solid middle class in 2-3 generations.
And I’d be happy to submit whatever kind of explanation I think might fit the facts of any situation, regardless of group.