UBI is not the answer to the modern ghetto. Regardless of race. We much first address problems with culture and education. Or at the very least do that in conjunction with UBI.
Sounds like you're having the wrong discussion. It shouldn't be about "UBI" or "not UBI", it should be about educating teenagers and young adults from poor families how to make a living and climb up the social ladder.
(I'm going to make a guess and say that this part of the discussion is ignored because it's evident that there's only limited space in the upper and middle classes of society.)
But, consider this: when we say education in the U.S., we imply westernization. Who are you to decide for someone else that their culture of ignorance is inferior to your own?
Life is complicated. I personally feel that, historically, these kinds of interventions do more harm than good. If you really want to solve a problem, you dont need to add regulations, you need to get more people on the same page, in general.