Those links do not break down the data enough to prove anything conclusive due to the populations of higher education and income before coming to the country skewing the data. Do you have anything that breaks it down to the level of country of origin, education, yearly income in country of origin, etc?
There is a lady from Haiti on my team that her parents were granted political asylum. Both her parents have phd's and strong morals. I would literally trust her with my children and think highly of them. Her entire family is amazing and are successful.
I think what Tim is getting at, is why allow low income and low education immigrants into the country when we already have our own low income/skilled minorities that need the help 1st.