Being born on a rich family is akin to being on "welfare" through the years you need most.
A sibling comment pointed out the diffrence of money, but there's also a gap in the quality and quantity of opportunities to succeed.
One's a life of poverty and misery, the other is education, opportunity, social connections, etc. People can get the former already on welfare programs. Why don't we divert that 3 trillion we'd spend on BI and spend half of it in targeted ways that actually increase opportunity?
...all of this makes it weird that the biggest proponents of UBI are ultra wealthy.
Or, in terms software engineers should understand: why a complete rewrite when there's lots of low hanging bugs that we all know about?
How do you know? How many poor people have you asked?
(P.S. Don't assume that everyone who reads HN is wealthy.)