I see three problems with your (their) basic income notion, mentalfloss.
1. The ratchet effect. Ink won't even be dry on the law before people like you start screaming the basic income number is too low, and needs to be $24,000, or $30,000, or whatever.
2. They will never, ever tear down the huge, complex, labyrinthine social welfare structure. They'll just add the basic income on top of that.
3. Giving money to people who can't handle money ain't much better'n just flushing it. And don't get all outraged, I ain't saying no poor people can handle money. I'm saying a lot of them can't.