> One topic not addressed (but important) is what we do when someone spends the entirety of their basic income and has nothing left for food or shelter. Do we just let them starve to death in the street?

If you want to help, voluntarily, that is, of course, your choice. But if no one chooses to help them, well... the idea of individual responsibility for the outcome of your choices exists for a reason. By what possible argument can I claim that I should be able to blow all of my income on anything I want, except food and shelter, and then demand that someone else provide me food and shelter?