The most compelling case I've seen made recently for basic income is from Yanis Varoufakis (the infamous Greek finance minister who resigned after refusing to agree to the terms of the bailout that the Greek people voted against in a referendum):
https://www.youtube.com/watch?v=BvgdtF3y0SsThere were many gems in that talk, but this one stood out to me in particular:
"The right to turn down a job is essential for a well functioning labor market, and for a civilized society. And to have that right, a genuine right, to turn down a job, you must have an alternative: An outside option. Because desperate people will accept to do desperate things..."
"Libertarian economists, who claim that liberty is a driving force, define liberty in a negative sense, in the sense of an absence of constraints, of voluntarism: If you've said yes to some contract, that contract must be, by definition, a free contract, and therefore, it must be some act of free will... Well, it's not. The Mafia loves to give us options that we can't refuse, to make us offers we can't refuse. The fact that we say yes to them doesn't mean that they were chosen freely. The fact that the Greek government accepted the terms, last summer, of the troika, does not mean that it was a voluntary transaction. To have a free contract, to have a contract that is signed by both sides, representing and exuding the freedom of both sides, each side must have a capacity to say no. I said that before, and I am saying this once more: In essence, freedom in action requires a basic income."