How many lottery winners hold on to their winnings?
Let's be realistic. If you give the uneducated poor free money, the only thing that will change is how much money they have to spend on junk food and dated electriconics.
UBI as a policy in a place like the U.S. is hopelessly niave. Our culture of poverty if the typical culture of ignorant poverty. I speak as someone who lived among the poor-hell, in high school I dated two women from the same trailer park, poverty in the U.S. is about getting mine, and often times about getting one over the man.
These aren't temporarily downtrodden future intellectuals. These are people who haven't understood education or work for generations. But, on the other hand, who are we to claim our culture is superior?