As someone that leans left, this is one of the big arguments I make in favor of UBI.
Frankly, I'm tired of arguing over the minutia of welfare, unemployment benefits, the minimum wage, social security, etc.
Fine. Scrap most of our social assistance programs outside of healthcare and replace them with a UBI.
The progressive in me likes it because it gives everyone a minimum safety net and the capitalist in me likes it because it opens up entrepreneurism and the ability to pursue potentially innovative businesses -- especially in an economy increasingly geared toward service and information work -- to huge portions of the population that are otherwise locked out. Active, small businesses are good for everyone.